[FR] Condition valid for <x> time (duration condition)

[MayeulC]

Is your feature request related to a problem? Please describe.
A friend asked if it was possible to turn their phone off if the screen had been off and the phone not charging for 30 minutes.

The two "screen" and "power" conditions are easy enough to implement, but I couldn't see how to implement the duration condition.

Describe the solution you'd like
I can imagine a new field on every condition "valid for", this is how HomeAssistant approaches the problem:

Describe alternatives you've considered [optional]
Alternatively, a new condition: "timer" to put as a child.
If the input condition is valid for <time>, the condition becomes valid.

Variants can be used too, like an inverted timer that turns off after a while.

Additional context
I don't think this can be achieved with the current "time" condition, as this is time-based and not duration-based.