diff --git a/babex-vue/src/api.ts b/babex-vue/src/api.ts
index 3ac63e92..0b8f9781 100644
--- a/babex-vue/src/api.ts
+++ b/babex-vue/src/api.ts
@@ -217,7 +217,6 @@ class GenericApiPart<T> extends ApiPart {
 
 interface AppointmentCreate {
     start: Date,
-    end: Date,
     experiment: number,
     leader: number,
     participant: number,
diff --git a/babex-vue/src/components/agenda/AgendaCalendar.vue b/babex-vue/src/components/agenda/AgendaCalendar.vue
index ed895e25..1d229fc8 100644
--- a/babex-vue/src/components/agenda/AgendaCalendar.vue
+++ b/babex-vue/src/components/agenda/AgendaCalendar.vue
@@ -20,7 +20,7 @@
         // optional experiment id for limiting feeds
         experiment?: number,
 
-        scheduling?: boolean,
+        duration?: number,
     }>();
 
     // from https://stackoverflow.com/a/64090995
@@ -130,7 +130,9 @@
         allDaySlot: false,
         slotMinTime: "07:00:00",
         slotMaxTime: "20:00:00",
-        slotDuration: props.scheduling ? "00:15:00" : "00:30:00",
+        slotDuration: {minutes: props.duration ?? 30},
+        defaultTimedEventDuration: {minutes: props.duration},
+        forceEventDuration: props.duration ? true : false,
         eventTimeFormat: {
             hour: '2-digit',
             minute: '2-digit',
diff --git a/babex-vue/src/components/agenda/AppointmentForm.vue b/babex-vue/src/components/agenda/AppointmentForm.vue
index 7c9ee271..75cf35be 100644
--- a/babex-vue/src/components/agenda/AppointmentForm.vue
+++ b/babex-vue/src/components/agenda/AppointmentForm.vue
@@ -1,5 +1,5 @@
 <script lang="ts" setup>
-    import {defineEmits, defineProps, ref} from 'vue';
+    import {computed, defineEmits, defineProps, ref} from 'vue';
     import {babexApi} from '../../api';
     import {Location} from '../../types';
     import { _ } from '@/util';
@@ -18,7 +18,6 @@
 
     const form = ref({
         start: props.event.start,
-        end: props.event.end,
         comment: props.event ? props.event.extendedProps.comment : null,
         location: props.event.extendedProps.location,
         leader: props.event.extendedProps.leader,
@@ -64,6 +63,9 @@
     function isCanceled() {
         return props.event.extendedProps.outcome == 'CANCELED';
     }
+
+    const eventEnd = computed(
+        () => new Date(form.value!.start.getTime() + 60 * 1000 * props.event.extendedProps.experiment.session_duration));
 </script>
 
 <template>
@@ -101,7 +103,7 @@
         <DateTimePicker class="appointment-start" v-model="form.start" :readonly="hasOutcome()" />
 
         <div>{{ _('To:') }}</div>
-        <DateTimePicker class="appointment-end" v-model="form.end" :readonly="hasOutcome()" />
+        <DateTimePicker class="appointment-end" v-model="eventEnd" :readonly="true" />
 
         <div>
             <label>{{ _('Comments:') }}</label>
@@ -121,7 +123,7 @@
             </div>
         </div>
 
-        <div class="mt-4"><button class="btn btn-primary save" :disabled="form.end <= form.start">{{ _('Save') }}</button></div>
+        <div class="mt-4"><button class="btn btn-primary save">{{ _('Save') }}</button></div>
     </form>
 
     <div v-if="!isPast() && !isCanceled()">
diff --git a/babex-vue/src/components/invite/CallHome.vue b/babex-vue/src/components/invite/CallHome.vue
index b3965d85..df77dc4f 100644
--- a/babex-vue/src/components/invite/CallHome.vue
+++ b/babex-vue/src/components/invite/CallHome.vue
@@ -1,6 +1,6 @@
 <script lang="ts" setup>
     import { _ } from '@/util';
-    import {defineProps, ref} from 'vue';
+    import {defineProps, ref, computed} from 'vue';
     import AgendaCalendar from '../agenda/AgendaCalendar.vue';
     import {babexApi} from '../../api';
     import {Call} from '../../types';
@@ -10,7 +10,7 @@
 
     const props = defineProps<{
         participant: {id: number, name: string},
-        experiment: {id: number, name: string},
+        experiment: {id: number, name: string, session_duration: number},
         leaders: {id: number, name: string}[],
         statuses: { [id: string]: string},
         call: Call,
@@ -32,7 +32,7 @@
     // event start and end times saved as separate refs because
     // our DateTimePicker doesn't play nicely with fullcalendar's event object
     const eventStart = ref<Date|null>(null);
-    const eventEnd = ref<Date|null>(null);
+    const eventEnd = computed(() => new Date(eventStart.value!.getTime() + 60 * 1000 * props.experiment.session_duration));
 
     const callStatus = ref<string|null>(null);
     const comment = ref('');
@@ -72,13 +72,12 @@
     }
 
     function confirm() {
-        if(!event.value || !eventStart.value || !eventEnd.value) {
+        if(!event.value || !eventStart.value) {
             return;
         }
 
         babexApi.call.appointment.create({
             start: eventStart.value,
-            end: eventEnd.value,
             experiment: props.experiment.id,
             participant: props.participant.id,
             leader: confirmationForm.value.leader,
@@ -112,11 +111,9 @@
             }
             event.value = calendar.value?.calendar.getApi().addEvent({
                 start: selectionInfo.start,
-                end: selectionInfo.end,
                 startEditable: true
             });
-            eventStart.value = selectionInfo.start;
-            eventEnd.value = selectionInfo.end;
+            eventStart.value = event.value!.start;
         }
         else {
             step.value = 1;
@@ -170,6 +167,7 @@
     function complete() {
         location.href = props.completeUrl;
     }
+
 </script>
 
 <template>
@@ -204,7 +202,7 @@
                 <div class="modal-dialog modal-dialog-centered modal-lg">
                     <div v-if="step < 2" class="modal-content">
                         <div class="modal-body">
-                            <AgendaCalendar ref="calendar" @select="onSelect" :start="start" :end="end" :experiment="experiment.id" :scheduling="true"></AgendaCalendar>
+                            <AgendaCalendar ref="calendar" @select="onSelect" :start="start" :end="end" :experiment="experiment.id" :duration="experiment.session_duration"></AgendaCalendar>
                         </div>
                         <div class="modal-footer">
                             <button @click="reset()" type="button" class="btn btn-secondary" :disabled="step < 1">{{ _('Back') }}</button>
@@ -212,7 +210,7 @@
                             <button @click="modalVisible = false" type="button" class="btn btn-secondary">{{ _('Cancel') }}</button>
                         </div>
                     </div>
-                    <div v-if="step === 2 && eventStart && eventEnd" class="modal-content">
+                    <div v-if="step === 2 && eventStart" class="modal-content">
                         <div class="modal-body">
                             <h2>{{ _('Appointment details') }}</h2>
                             <table class="table mt-3">
@@ -225,7 +223,7 @@
                                 </tr>
                                 <tr>
                                     <th>{{ _('To') }}</th>
-                                    <td><DateTimePicker v-model="eventEnd" /></td>
+                                    <td><DateTimePicker :readonly="true" v-model="eventEnd" /></td>
                                 </tr>
                             </table>
 
diff --git a/integration_tests/test_invite.py b/integration_tests/test_invite.py
index 50266814..5904aeea 100644
--- a/integration_tests/test_invite.py
+++ b/integration_tests/test_invite.py
@@ -33,7 +33,7 @@ def test_cancel_appointment_from_email(apps, participant, mailbox, link_from_mai
     DefaultCriteria = apps.lab.get_model('experiments', 'DefaultCriteria')
     User = apps.lab.get_model('main', 'User')
     Appointment = apps.lab.get_model('experiments', 'Appointment')
-    experiment = Experiment.objects.create(defaultcriteria=DefaultCriteria.objects.create())
+    experiment = Experiment.objects.create(duration=10, session_duration=20)
 
     # somewhat abusing the get_model() calls above to setup django for the following to work
     from experiments.models import make_appointment
@@ -41,10 +41,9 @@ def test_cancel_appointment_from_email(apps, participant, mailbox, link_from_mai
 
     leader = User.objects.first()  # admin
     start = timezone.now()
-    end = start + timedelta(hours=1)
     experiment.leaders.add(leader)
     experiment.save()
-    appointment = make_appointment(experiment, participant, leader, start, end)
+    appointment = make_appointment(experiment, participant, leader, start)
 
     send_appointment_mail(appointment, prepare_appointment_mail(appointment))
 
@@ -71,7 +70,8 @@ def test_appointment_in_parent_overview(apps, participant, mailbox, page, login_
     Experiment = apps.lab.get_model('experiments', 'Experiment')
     DefaultCriteria = apps.lab.get_model('experiments', 'DefaultCriteria')
     User = apps.lab.get_model('main', 'User')
-    experiment = Experiment.objects.create(defaultcriteria=DefaultCriteria.objects.create(),
+    experiment = Experiment.objects.create(duration=10,
+                                           session_duration=20,
                                            name='Test Experiment')
 
     # somewhat abusing the get_model() calls above to setup django for the following to work
@@ -79,10 +79,9 @@ def test_appointment_in_parent_overview(apps, participant, mailbox, page, login_
 
     leader = User.objects.first()  # admin
     start = timezone.now()
-    end = start + timedelta(hours=1)
     experiment.leaders.add(leader)
     experiment.save()
-    appointment = make_appointment(experiment, participant, leader, start, end)
+    appointment = make_appointment(experiment, participant, leader, start)
 
     login_as(participant.email)
     try:
@@ -99,7 +98,8 @@ def test_past_appointment_not_in_parent_overview(apps, participant, mailbox, pag
     Experiment = apps.lab.get_model('experiments', 'Experiment')
     DefaultCriteria = apps.lab.get_model('experiments', 'DefaultCriteria')
     User = apps.lab.get_model('main', 'User')
-    experiment = Experiment.objects.create(defaultcriteria=DefaultCriteria.objects.create(),
+    experiment = Experiment.objects.create(duration=10,
+                                           session_duration=20,
                                            name='Test Experiment')
 
     # somewhat abusing the get_model() calls above to setup django for the following to work
@@ -107,10 +107,9 @@ def test_past_appointment_not_in_parent_overview(apps, participant, mailbox, pag
 
     leader = User.objects.first()  # admin
     start = timezone.now() - timedelta(days=30)
-    end = start + timedelta(hours=1)
     experiment.leaders.add(leader)
     experiment.save()
-    appointment = make_appointment(experiment, participant, leader, start, end)
+    appointment = make_appointment(experiment, participant, leader, start)
 
     login_as(participant.email)
     try:
diff --git a/lab/agenda/views.py b/lab/agenda/views.py
index e160c81c..5460b039 100644
--- a/lab/agenda/views.py
+++ b/lab/agenda/views.py
@@ -96,7 +96,7 @@ def perform_update(self, serializer):
         updated_timeslot = updated.timeslot
 
         # check if we should inform the participant about changed time
-        if original_timeslot.start != updated_timeslot.start or original_timeslot.end != updated_timeslot.end:
+        if original_timeslot.start != updated_timeslot.start:
             send_appointment_mail(updated, prepare_appointment_mail(updated))
 
 
diff --git a/lab/conftest.py b/lab/conftest.py
index 74b4da58..14ad253a 100644
--- a/lab/conftest.py
+++ b/lab/conftest.py
@@ -9,7 +9,7 @@
 
 @pytest.fixture
 def sample_experiment(admin_user, db):
-    yield admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create())
+    yield admin_user.experiments.create(duration=15, session_duration=30)
 
 
 @pytest.fixture
diff --git a/lab/experiments/email.py b/lab/experiments/email.py
index dd9a8c50..2abd579f 100644
--- a/lab/experiments/email.py
+++ b/lab/experiments/email.py
@@ -43,8 +43,8 @@ def __init__(self, *args, **kwargs):
     </p>
     <p>
         <strong>Het experiment</strong><br/>
-        Het experiment duurt maximaal {{experiment_duration}}.
-        Omdat we ook de procedure uitleggen en er achteraf tijd is voor vragen, zult u ongeveer {{session_duration}} kwijt zijn
+        Het experiment duurt maximaal {{experiment_duration}} minuten.
+        Omdat we ook de procedure uitleggen en er achteraf tijd is voor vragen, zult u ongeveer {{session_duration}} minuten kwijt zijn
         aan uw bezoek aan het Babylab. In de bijlage van deze mail vindt u meer informatie over het experiment en onze werkwijze.
     </p>
     <p>
diff --git a/lab/experiments/forms/experiment_forms.py b/lab/experiments/forms/experiment_forms.py
index 408ff316..9726414b 100644
--- a/lab/experiments/forms/experiment_forms.py
+++ b/lab/experiments/forms/experiment_forms.py
@@ -48,8 +48,6 @@ class Meta:
         exclude = ("defaultcriteria",)
         widgets = {
             "name": forms.TextInput,
-            "duration": forms.TextInput,
-            "session_duration": forms.TextInput,
             "task_description": forms.Textarea(
                 {
                     "rows": 7,
diff --git a/lab/experiments/locale/en/LC_MESSAGES/django.po b/lab/experiments/locale/en/LC_MESSAGES/django.po
index bbf5add2..e0abeeaa 100644
--- a/lab/experiments/locale/en/LC_MESSAGES/django.po
+++ b/lab/experiments/locale/en/LC_MESSAGES/django.po
@@ -917,4 +917,7 @@ msgid "default_criteria:attribute:min_age"
 msgstr "Min. age"
 
 msgid "default_criteria:attribute:max_age"
-msgstr "Max. age"
\ No newline at end of file
+msgstr "Max. age"
+
+msgid "experiments:duration:minutes"
+msgstr "minutes"
\ No newline at end of file
diff --git a/lab/experiments/locale/nl/LC_MESSAGES/django.po b/lab/experiments/locale/nl/LC_MESSAGES/django.po
index 8e08fa5e..9008921c 100644
--- a/lab/experiments/locale/nl/LC_MESSAGES/django.po
+++ b/lab/experiments/locale/nl/LC_MESSAGES/django.po
@@ -949,4 +949,7 @@ msgstr "Geëxcludeerd"
 
 #: experiments/models/appointment_models.py:38
 msgid "experiments:appointment:outcome:canceled"
-msgstr "Geannuleerd"
\ No newline at end of file
+msgstr "Geannuleerd"
+
+msgid "experiments:duration:minutes"
+msgstr "minuten"
\ No newline at end of file
diff --git a/lab/experiments/migrations/0023_alter_experiment_confirmation_email_and_more.py b/lab/experiments/migrations/0023_alter_experiment_confirmation_email_and_more.py
new file mode 100644
index 00000000..418576fd
--- /dev/null
+++ b/lab/experiments/migrations/0023_alter_experiment_confirmation_email_and_more.py
@@ -0,0 +1,33 @@
+# Generated by Django 4.2.11 on 2024-11-14 09:09
+
+from django.db import migrations, models
+import experiments.email
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("experiments", "0022_alter_experiment_confirmation_email"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="experiment",
+            name="confirmation_email",
+            field=models.TextField(
+                default='<p>Beste {{parent_name}},</p>\n    <p>\n        U heeft een afspraak gemaakt om mee te doen met het experiment:\n        <strong>{{experiment_name}}</strong><br/><br/>\n        We verwachten u en {{participant_name}} op:<br/><br/>\n        Datum: <strong>{{date}}</strong><br/>\n        Tijd: <strong>{{time}} uur</strong><br/>\n        Locatie: <strong>Janskerkhof 13a</strong> (let op: dit is de groene voordeur met de helling ervoor).<br/>\n    </p>\n    <p>\n        <strong>Gezondheidsklachten</strong><br/>\n        Wij vragen u de afspraak te verzetten wanneer uw kind vlak voor de afspraak gehoorproblemen\n        en/of oorontsteking heeft en dus mogelijk minder goed hoort.\n    </p>\n    <p>\n        <strong>Aankomst in het Babylab</strong><br/>\n        Als u aanbelt bij Janskerkhof 13a en via de intercom zegt dat u voor het Babylab komt, dan wordt de deur op afstand voor u geopend.\n        Wanneer u binnenkomt, kunt u gelijk na de hal met de lift (of met de trap) naar beneden.\n        Daar vindt u aan uw rechterhand de wachtkamer, waar u plaats kunt nemen. De onderzoeksassistent zal u daar komen ophalen.\n    </p>\n    <p>\n        <strong>Het experiment</strong><br/>\n        Het experiment duurt maximaal {{experiment_duration}} minuten.\n        Omdat we ook de procedure uitleggen en er achteraf tijd is voor vragen, zult u ongeveer {{session_duration}} minuten kwijt zijn\n        aan uw bezoek aan het Babylab. In de bijlage van deze mail vindt u meer informatie over het experiment en onze werkwijze.\n    </p>\n    <p>\n        Het is belangrijk voor ons onderzoek dat er geen broertje of zusje meekomt tijdens het bezoek aan het lab.\n        Als u hierover van tevoren een andere afspraak heeft gemaakt met de assistent van het Babylab, dan geldt uiteraard die afspraak.\n    </p>\n    <p>\n        <strong>Afspraak verzetten/afzeggen</strong><br/>\n        Als u deze afspraak wilt afzeggen, kunt u dat doen via <a href="{{cancel_link}}">deze link</a>.\n        Doe dat a.u.b. minstens 24 uur van tevoren. Als u vlak van tevoren ontdekt dat u verhinderd bent,\n        neem dan contact op met de testleider ({{leader_name}}, email: babylab.ilslabs@uu.nl).\n    </p>\n    <p>\n        Meer informatie over het Babylab, bijvoorbeeld de routebeschrijving, kunt u vinden op de\n        <a href="https://babylab.wp.hum.uu.nl/">website van het Babylab</a>.\n        Wij danken u alvast hartelijk voor uw medewerking. Zonder uw deelname kunnen wij geen onderzoek doen!\n    </p>\n    <p>\n        Vriendelijke groet,<br/><br/>\n        Het team van het Babylab voor Taalonderzoek\n    </p>',
+                help_text=experiments.email.AppointmentConfirmEmail.help_text,
+                verbose_name="experiment:attribute:confirmation_email",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="experiment",
+            name="duration",
+            field=models.IntegerField(verbose_name="experiment:attribute:duration"),
+        ),
+        migrations.AlterField(
+            model_name="experiment",
+            name="session_duration",
+            field=models.IntegerField(verbose_name="experiment:attribute:session_duration"),
+        ),
+    ]
diff --git a/lab/experiments/models/appointment_models.py b/lab/experiments/models/appointment_models.py
index 138eb13e..b6f2d211 100644
--- a/lab/experiments/models/appointment_models.py
+++ b/lab/experiments/models/appointment_models.py
@@ -1,4 +1,4 @@
-from datetime import datetime
+from datetime import datetime, timedelta
 
 from cdh.mail.classes import TemplateEmail
 from django.db import models
@@ -69,7 +69,11 @@ def save(self, *args, **kwargs):
         # verify that the leader is valid
         if self.leader not in self.experiment.leaders.all():
             raise ValueError("Leader {} is not part of experiment {}".format(self.leader, self.experiment))
+
+        # make sure the end time is correct
+        self.end = self.start + timedelta(minutes=self.experiment.session_duration)
         self.timeslot.save()
+
         super().save(*args, **kwargs)
 
     def __str__(self):
@@ -108,10 +112,12 @@ def is_canceled(self):
         return self.outcome == Appointment.Outcome.CANCELED
 
 
-def make_appointment(experiment: Experiment, participant: Participant, leader: User, start: datetime, end: datetime):
+def make_appointment(experiment: Experiment, participant: Participant, leader: User, start: datetime):
     if leader not in experiment.leaders.all():
         raise ValueError(f'{leader} is not a leader in the experiment "{experiment}"')
 
+    # appointment end is determined by the experiment's session duration
+    end = start + timedelta(minutes=experiment.session_duration)
     timeslot = TimeSlot.objects.create(start=start, end=end, experiment=experiment)
     appointment = Appointment.objects.create(
         participant=participant, timeslot=timeslot, experiment=experiment, leader=leader
diff --git a/lab/experiments/models/experiment_models.py b/lab/experiments/models/experiment_models.py
index 9545b7f6..97276953 100644
--- a/lab/experiments/models/experiment_models.py
+++ b/lab/experiments/models/experiment_models.py
@@ -25,9 +25,9 @@ def _get_dt_2_hours_ago() -> datetime:
 class Experiment(models.Model):
     name = models.TextField(_("experiment:attribute:name"))
 
-    duration = models.TextField(_("experiment:attribute:duration"))
+    duration = models.IntegerField(_("experiment:attribute:duration"))
 
-    session_duration = models.TextField(_("experiment:attribute:session_duration"))
+    session_duration = models.IntegerField(_("experiment:attribute:session_duration"))
 
     # how many participants are aimed for
     recruitment_target = models.PositiveIntegerField(
diff --git a/lab/experiments/serializers.py b/lab/experiments/serializers.py
index f5bcf560..5ccae25e 100644
--- a/lab/experiments/serializers.py
+++ b/lab/experiments/serializers.py
@@ -17,7 +17,7 @@ class AppointmentSerializer(serializers.ModelSerializer):
     class AppointmentExperimentSerializer(serializers.ModelSerializer):
         class Meta:
             model = Experiment
-            fields = ["id", "name", "leaders"]
+            fields = ["id", "name", "leaders", "session_duration"]
 
         leaders = ExperimentLeadersSerializer(read_only=True, many=True)
 
@@ -51,7 +51,7 @@ class Meta:
     contact_phone = serializers.ReadOnlyField(source="leader.phonenumber")
 
     start = serializers.DateTimeField()
-    end = serializers.DateTimeField()
+    end = serializers.ReadOnlyField()
 
     session_duration = serializers.ReadOnlyField(source="experiment.session_duration")
 
@@ -70,6 +70,7 @@ class Meta:
             "id",
             "name",
             "duration",
+            "session_duration",
             "task_description",
             "location",
             "leaders",
@@ -104,6 +105,6 @@ class Meta:
     contact_phone = serializers.ReadOnlyField(source="leader.phonenumber")
 
     start = serializers.DateTimeField()
-    end = serializers.DateTimeField()
+    end = serializers.ReadOnlyField()
 
     session_duration = serializers.ReadOnlyField(source="experiment.session_duration")
diff --git a/lab/experiments/templates/call/home.html b/lab/experiments/templates/call/home.html
index 019110a3..1eb3ec74 100644
--- a/lab/experiments/templates/call/home.html
+++ b/lab/experiments/templates/call/home.html
@@ -57,11 +57,11 @@ <h2>Experiment details</h2>
                         </tr>
                         <tr>
                             <td> {% get_verbose_field_name "experiments" "Experiment" "duration" %} </td>
-                            <td> {{ experiment.duration }} </td>
+                            <td> {{ experiment.duration }} {% translate "experiments:duration:minutes" %}</td>
                         </tr>
                         <tr>
                             <td> {% get_verbose_field_name "experiments" "Experiment" "session_duration" %} </td>
-                            <td> {{ experiment.session_duration }} </td>
+                            <td> {{ experiment.session_duration }} {% translate "experiments:duration:minutes" %}</td>
                         </tr>
                         <tr>
                             <td> {% get_verbose_field_name "experiments" "Experiment" "location" %} </td>
diff --git a/lab/experiments/templates/experiments/detail_parts/info.html b/lab/experiments/templates/experiments/detail_parts/info.html
index ac4f27c5..298fbc1f 100644
--- a/lab/experiments/templates/experiments/detail_parts/info.html
+++ b/lab/experiments/templates/experiments/detail_parts/info.html
@@ -58,7 +58,7 @@
                     {% trans 'experiment:attribute:duration' %}
                 </td>
                 <td>
-                    {{ experiment.duration }}
+                    {{ experiment.duration }} {% translate "experiments:duration:minutes" %}
                 </td>
             </tr>
             <tr>
@@ -66,7 +66,7 @@
                     {% trans 'experiment:attribute:session_duration' %}
                 </td>
                 <td>
-                    {{ experiment.session_duration }}
+                    {{ experiment.session_duration }} {% translate "experiments:duration:minutes" %}
                 </td>
             </tr>
             <tr>
diff --git a/lab/experiments/test_exclusion.py b/lab/experiments/test_exclusion.py
index 1bae0f0f..9f2d9fb8 100644
--- a/lab/experiments/test_exclusion.py
+++ b/lab/experiments/test_exclusion.py
@@ -8,9 +8,9 @@
 
 
 def test_excluded_experiment(admin_user, sample_participant):
-    experiment_1 = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create())
-    experiment_2 = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create())
-    experiment_3 = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create())
+    experiment_1 = admin_user.experiments.create(duration=10, session_duration=20)
+    experiment_2 = admin_user.experiments.create(duration=10, session_duration=20)
+    experiment_3 = admin_user.experiments.create(duration=10, session_duration=20)
 
     # mark participant as having participated in experiment #1
     timeslot = TimeSlot.objects.create(
@@ -29,8 +29,8 @@ def test_excluded_experiment(admin_user, sample_participant):
 
 
 def test_required_experiment(admin_user, sample_participant):
-    experiment_1 = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create())
-    experiment_2 = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create())
+    experiment_1 = admin_user.experiments.create(duration=10, session_duration=20)
+    experiment_2 = admin_user.experiments.create(duration=10, session_duration=20)
 
     # cannot participate in #2 unless participated in #1
     experiment_2.required_experiments.add(experiment_1)
@@ -50,9 +50,9 @@ def test_required_experiment(admin_user, sample_participant):
 
 
 def test_required_experiment_multiple(admin_user, sample_participant):
-    experiment_1 = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create())
-    experiment_2 = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create())
-    experiment_3 = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create())
+    experiment_1 = admin_user.experiments.create(duration=10, session_duration=20)
+    experiment_2 = admin_user.experiments.create(duration=10, session_duration=20)
+    experiment_3 = admin_user.experiments.create(duration=10, session_duration=20)
 
     # cannot participat in #3 unless participated in #1 and #2
     experiment_3.required_experiments.add(experiment_1)
@@ -82,7 +82,9 @@ def set_participant_field(participant, field_name, value):
 
 def test_parent_criterion_required(admin_user, sample_participant):
     for criterion in ["dyslexic_parent", "tos_parent"]:
-        experiment = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create(**{criterion: "Y"}))
+        experiment = admin_user.experiments.create(
+            duration=10, session_duration=20, defaultcriteria=DefaultCriteria.objects.create(**{criterion: "Y"})
+        )
         for value in [Participant.WhichParent.FEMALE, Participant.WhichParent.MALE, Participant.WhichParent.BOTH]:
             set_participant_field(sample_participant, criterion, value)
             assert sample_participant in get_eligible_participants_for_experiment(
@@ -97,7 +99,9 @@ def test_parent_criterion_required(admin_user, sample_participant):
 
 def test_parent_criterion_excluded(admin_user, sample_participant):
     for criterion in ["dyslexic_parent", "tos_parent"]:
-        experiment = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create(**{criterion: "N"}))
+        experiment = admin_user.experiments.create(
+            duration=10, session_duration=20, defaultcriteria=DefaultCriteria.objects.create(**{criterion: "N"})
+        )
         for value in [
             Participant.WhichParent.FEMALE,
             Participant.WhichParent.MALE,
@@ -113,7 +117,7 @@ def test_parent_criterion_excluded(admin_user, sample_participant):
 
 def test_parent_criterion_indifferent(admin_user, sample_participant):
     for criterion in ["dyslexic_parent", "tos_parent"]:
-        experiment = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create())
+        experiment = admin_user.experiments.create(duration=10, session_duration=20)
         for value in [choice[0] for choice in Participant.WhichParent.choices]:
             set_participant_field(sample_participant, criterion, value)
             assert sample_participant in get_eligible_participants_for_experiment(
@@ -121,7 +125,7 @@ def test_parent_criterion_indifferent(admin_user, sample_participant):
             ), f"Participant with field {criterion} set to {value} is missing from eligible set"
 
         experiment = admin_user.experiments.create(
-            defaultcriteria=DefaultCriteria.objects.create(**{criterion: ["Y", "N"]})
+            duration=10, session_duration=20, defaultcriteria=DefaultCriteria.objects.create(**{criterion: ["Y", "N"]})
         )
         for value in [choice[0] for choice in Participant.WhichParent.choices]:
             set_participant_field(sample_participant, criterion, value)
@@ -138,14 +142,16 @@ def test_participant_criteria(admin_user, sample_participant):
             set_participant_field(sample_participant, criterion_name, option)
 
             # indifferent
-            experiment = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create())
+            experiment = admin_user.experiments.create(duration=10, session_duration=20)
             assert sample_participant in get_eligible_participants_for_experiment(
                 experiment
             ), f"Participant with field {criterion_name} set to {option} is missing from eligible set"
 
             # included
             experiment = admin_user.experiments.create(
-                defaultcriteria=DefaultCriteria.objects.create(**{criterion_name: [option]})
+                duration=10,
+                session_duration=20,
+                defaultcriteria=DefaultCriteria.objects.create(**{criterion_name: [option]}),
             )
             assert sample_participant in get_eligible_participants_for_experiment(
                 experiment
@@ -153,7 +159,9 @@ def test_participant_criteria(admin_user, sample_participant):
 
             # excluded
             experiment = admin_user.experiments.create(
-                defaultcriteria=DefaultCriteria.objects.create(**{criterion_name: list(options - set([option]))})
+                duration=10,
+                session_duration=20,
+                defaultcriteria=DefaultCriteria.objects.create(**{criterion_name: list(options - set([option]))}),
             )
             assert sample_participant not in get_eligible_participants_for_experiment(
                 experiment
@@ -168,36 +176,46 @@ def test_multilingual_criterion(admin_user, sample_participant):
     sample_participant.data.languages.set([en, nl])
 
     # indifferent
-    experiment = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create())
+    experiment = admin_user.experiments.create(duration=10, session_duration=20)
     assert sample_participant in get_eligible_participants_for_experiment(experiment)
 
     # included
-    experiment = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create(multilingual=["Y"]))
+    experiment = admin_user.experiments.create(
+        duration=10, session_duration=20, defaultcriteria=DefaultCriteria.objects.create(multilingual=["Y"])
+    )
     assert sample_participant in get_eligible_participants_for_experiment(experiment)
 
     # excluded
-    experiment = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create(multilingual=["N"]))
+    experiment = admin_user.experiments.create(
+        duration=10, session_duration=20, defaultcriteria=DefaultCriteria.objects.create(multilingual=["N"])
+    )
     assert sample_participant not in get_eligible_participants_for_experiment(experiment)
 
     # monolingual participant
     sample_participant.data.languages.set([en])
 
     # indifferent
-    experiment = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create())
+    experiment = admin_user.experiments.create(duration=10, session_duration=20)
     assert sample_participant in get_eligible_participants_for_experiment(experiment)
 
     # included
-    experiment = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create(multilingual=["N"]))
+    experiment = admin_user.experiments.create(
+        duration=10, session_duration=20, defaultcriteria=DefaultCriteria.objects.create(multilingual=["N"])
+    )
     assert sample_participant in get_eligible_participants_for_experiment(experiment)
 
     # excluded
-    experiment = admin_user.experiments.create(defaultcriteria=DefaultCriteria.objects.create(multilingual=["Y"]))
+    experiment = admin_user.experiments.create(
+        duration=10, session_duration=20, defaultcriteria=DefaultCriteria.objects.create(multilingual=["Y"])
+    )
     assert sample_participant not in get_eligible_participants_for_experiment(experiment)
 
 
 def test_age_filters(admin_user, sample_participant):
     experiment = admin_user.experiments.create(
-        defaultcriteria=DefaultCriteria.objects.create(min_age_days=5, min_age_months=3)
+        duration=10,
+        session_duration=20,
+        defaultcriteria=DefaultCriteria.objects.create(min_age_days=5, min_age_months=3),
     )
 
     # too young
@@ -211,7 +229,9 @@ def test_age_filters(admin_user, sample_participant):
     assert sample_participant in get_eligible_participants_for_experiment(experiment)
 
     experiment = admin_user.experiments.create(
-        defaultcriteria=DefaultCriteria.objects.create(max_age_days=5, max_age_months=3)
+        duration=10,
+        session_duration=20,
+        defaultcriteria=DefaultCriteria.objects.create(max_age_days=5, max_age_months=3),
     )
 
     # too old
@@ -225,9 +245,11 @@ def test_age_filters(admin_user, sample_participant):
     assert sample_participant in get_eligible_participants_for_experiment(experiment)
 
     experiment = admin_user.experiments.create(
+        duration=10,
+        session_duration=20,
         defaultcriteria=DefaultCriteria.objects.create(
             min_age_days=5, min_age_months=3, max_age_days=15, max_age_months=6
-        )
+        ),
     )
 
     # too old
diff --git a/lab/experiments/test_views.py b/lab/experiments/test_views.py
index 757c2486..09a7bbef 100644
--- a/lab/experiments/test_views.py
+++ b/lab/experiments/test_views.py
@@ -21,7 +21,7 @@ class AppointmentTests(TestCase):
     @classmethod
     def setUpTestData(cls):
         cls.user = User.objects.create(username="test", is_staff=True)
-        cls.experiment = Experiment.objects.create()
+        cls.experiment = Experiment.objects.create(duration=15, session_duration=30)
         cls.experiment.leaders.add(cls.user)
 
         cls.participant = Participant.objects.create(
@@ -35,7 +35,6 @@ def test_appointment_confirm(self):
         data = {
             "experiment": self.experiment.pk,
             "start": timezone.now() + timedelta(days=1),
-            "end": timezone.now() + timedelta(days=1, hours=1),
             "leader": self.user.pk,
             "participant": self.participant.pk,
         }
@@ -49,7 +48,6 @@ def test_appointment_confirm_fail_in_past(self):
         data = {
             "experiment": self.experiment.pk,
             "start": timezone.now() - timedelta(hours=2),
-            "end": timezone.now() - timedelta(hours=1),
             "leader": self.user.pk,
             "participant": self.participant.pk,
         }
@@ -71,7 +69,6 @@ def test_appointment_confirm_when_eligible_age(self):
         data = {
             "experiment": self.experiment.pk,
             "start": timezone.now() + timedelta(days=7),
-            "end": timezone.now() + timedelta(days=7, hours=1),
             "leader": self.user.pk,
             "participant": self.participant.pk,
         }
@@ -92,7 +89,6 @@ def test_appointment_confirm_fail_when_ineligible(self):
         data = {
             "experiment": self.experiment.pk,
             "start": timezone.now() + timedelta(days=7),
-            "end": timezone.now() + timedelta(days=7, hours=1),
             "leader": self.user.pk,
             "participant": self.participant.pk,
         }
@@ -107,7 +103,7 @@ class InviteTests(TestCase):
     @classmethod
     def setUpTestData(cls):
         cls.user = User.objects.create(username="test", is_staff=True)
-        cls.experiment = Experiment.objects.create()
+        cls.experiment = Experiment.objects.create(duration=15, session_duration=30)
         cls.experiment.leaders.add(cls.user)
 
         cls.participant = Participant.objects.create(
diff --git a/lab/experiments/views/call_views.py b/lab/experiments/views/call_views.py
index 0b12cc5e..8330ae0b 100644
--- a/lab/experiments/views/call_views.py
+++ b/lab/experiments/views/call_views.py
@@ -93,9 +93,8 @@ def create(self, request, *args, **kwargs):
             raise PermissionDenied
 
         start = parse_datetime(request.data["start"])
-        end = parse_datetime(request.data["end"])
 
-        if end < start or start < timezone.now():
+        if start < timezone.now():
             raise BadRequest("Invalid appointment time")
 
         participant = Participant.objects.get(pk=request.data["participant"])
@@ -110,7 +109,7 @@ def create(self, request, *args, **kwargs):
             pk=request.data["leader"],
         )
 
-        appointment = make_appointment(experiment, participant, leader, start, end)
+        appointment = make_appointment(experiment, participant, leader, start)
         return JsonResponse(self.serializer_class(appointment).data)
 
     def check_age_at_appointment(self, participant: Participant, experiment: Experiment, start: datetime.date) -> bool:
diff --git a/lab/integration_tests/conftest.py b/lab/integration_tests/conftest.py
index e0440657..2c2e2368 100644
--- a/lab/integration_tests/conftest.py
+++ b/lab/integration_tests/conftest.py
@@ -44,10 +44,9 @@ def as_leader(page, django_user_model, live_server):
 @pytest.fixture
 def sample_experiment(admin_user, db, sample_location):
     yield admin_user.experiments.create(
-        defaultcriteria=DefaultCriteria.objects.create(),
         name="sample experiment",
-        duration="10 minutes",
-        session_duration="30 minutes",
+        duration=10,
+        session_duration=30,
         recruitment_target=50,
         task_description="task description",
         responsible_researcher="dr. Lin Guist",
diff --git a/lab/integration_tests/test_agenda.py b/lab/integration_tests/test_agenda.py
index 12b4de2c..afa0fa1f 100644
--- a/lab/integration_tests/test_agenda.py
+++ b/lab/integration_tests/test_agenda.py
@@ -117,7 +117,6 @@ def test_agenda_modify_appointment(page, appointment_tomorrow, as_leader):
     new_time = original_time + timedelta(days=3)
 
     page.fill(".appointment-start input", new_time.strftime("%d-%m-%Y %H:%M"))
-    page.fill(".appointment-end input", (new_time + timedelta(hours=1)).strftime("%d-%m-%Y %H:%M"))
     page.click(".action-panel .save")
 
     page.locator(".action-panel .save").wait_for(state="hidden")
@@ -130,16 +129,3 @@ def test_agenda_modify_appointment(page, appointment_tomorrow, as_leader):
     # check that an appointment update email was sent
     assert len(mail.outbox) == 1
     assert mail.outbox[0].to[0] == appointment_tomorrow.participant.email
-
-
-def test_agenda_modify_appointment_illegal(page, appointment_tomorrow, as_leader):
-    appointment_tomorrow.experiment.leaders.add(as_leader)
-    page.locator("a").get_by_text("Agenda").click()
-
-    page.click(f'td[data-date="{appointment_tomorrow.start.date()}"]')
-    original_time = appointment_tomorrow.timeslot.start
-    new_time = original_time + timedelta(days=3)
-
-    page.fill(".appointment-start input", new_time.strftime("%d-%m-%Y %H:%M"))
-
-    expect(page.locator(".action-panel .save")).to_be_disabled()
diff --git a/lab/integration_tests/test_experiments.py b/lab/integration_tests/test_experiments.py
index 2a2282b0..7956924a 100644
--- a/lab/integration_tests/test_experiments.py
+++ b/lab/integration_tests/test_experiments.py
@@ -11,8 +11,8 @@ def test_create_experiment(page, as_admin, sample_leader, sample_location):
 
     page.get_by_role("link", name="Create experiment").click()
     page.get_by_role("textbox", name="Name").fill("Experiment name")
-    page.get_by_role("textbox", name="Task duration").fill("10 minutes")
-    page.get_by_role("textbox", name="Session duration").fill("25 minutes")
+    page.get_by_role("spinbutton", name="Task duration").fill("10")
+    page.get_by_role("spinbutton", name="Session duration").fill("25")
     page.get_by_role("spinbutton", name="Recruitment target").fill("30")
 
     page.locator('select[name="location"]').select_option(sample_location.name)
diff --git a/parent/parent/templates/parent/overview.html b/parent/parent/templates/parent/overview.html
index bd105a5b..81d05f41 100644
--- a/parent/parent/templates/parent/overview.html
+++ b/parent/parent/templates/parent/overview.html
@@ -27,7 +27,7 @@ <h5 class="card-title"> {{ appointment.experiment }}
                             <div>Participant: {{ appointment.participant }}</div>
                             <div>Datum: {{ appointment.start|date:"l d M Y, H:i"|lower }}</div>
                             <div>Tijd:  {{ appointment.start|time }}</div>
-                            <div>Totale duur bezoek:  {{ appointment.session_duration }}</div>
+                            <div>Totale duur bezoek:  {{ appointment.session_duration }} minuten</div>
                             <div class="mt-3">Naam onderzoeker: {{ appointment.leader }}</div>
                             <div>Telefoonnummer onderzoeker: {{ appointment.contact_phone }}</div>