diff --git a/rollup/src/lib.rs b/rollup/src/lib.rs
index c901882..6f93ad7 100644
--- a/rollup/src/lib.rs
+++ b/rollup/src/lib.rs
@@ -1,4 +1,6 @@
 mod transaction;
+use std::time::Duration;
+
 use transaction::WithdrawalTxData;
 pub use transaction::{SignedTransaction, Transaction};
 
@@ -18,5 +20,5 @@ use blockchain::Blockchain;
 mod address;
 pub use address::Address;
 
-pub const BLOCK_PERIOD_MILLIS: u64 = 2000;
+pub const BLOCK_PERIOD: Duration = Duration::from_secs(2);
 pub const CHAIN_ID: u64 = 83479;
diff --git a/rollup/src/sequencer.rs b/rollup/src/sequencer.rs
index aebb6a2..e80a71c 100644
--- a/rollup/src/sequencer.rs
+++ b/rollup/src/sequencer.rs
@@ -3,12 +3,11 @@ use std::{
     pin::Pin,
     sync::{Arc, Mutex},
     task::{Context, Poll},
-    time::Duration,
 };
 
 use crate::{
     Block, BlockHeader, Blockchain, SignedBlockHeader, SignedTransaction, Signer, Transaction,
-    BLOCK_PERIOD_MILLIS,
+    BLOCK_PERIOD,
 };
 
 /// Permissioned entity responsible for maintaining the canonical [Blockchain].
@@ -34,7 +33,7 @@ impl Sequencer {
             blockchain: Blockchain::default(),
             transactions_pool: vec![],
             withdrawals_pool: vec![],
-            block_timer: tokio::time::interval(Duration::from_millis(BLOCK_PERIOD_MILLIS)),
+            block_timer: tokio::time::interval(BLOCK_PERIOD),
         }
     }
 
diff --git a/script/src/main.rs b/script/src/main.rs
index b986e31..ef03563 100644
--- a/script/src/main.rs
+++ b/script/src/main.rs
@@ -1,4 +1,4 @@
-use rollup::{Block, SignedTransaction, Signer, Transaction, BLOCK_PERIOD_MILLIS};
+use rollup::{Block, SignedTransaction, Signer, Transaction, BLOCK_PERIOD};
 use secp256k1::SecretKey;
 use tokio::process::Command;
 
@@ -38,13 +38,13 @@ async fn handle_request_err(e: reqwest::Error) {
     } else {
         println!("Error sending transaction: {:?}", e);
     }
-    tokio::time::sleep(tokio::time::Duration::from_secs(2)).await;
+    tokio::time::sleep(BLOCK_PERIOD).await;
 }
 
 /// Infinitely sends transactions to the sequencer.
 async fn tx_loop() {
     // Wait for the sequencer to start.
-    tokio::time::sleep(tokio::time::Duration::from_secs(2)).await;
+    tokio::time::sleep(BLOCK_PERIOD).await;
     for i in 0.. {
         // Send a deposit transaction.
         let signer = Signer::random();
@@ -65,13 +65,13 @@ async fn tx_loop() {
         }
 
         // Wait before sending the next transactions.
-        tokio::time::sleep(tokio::time::Duration::from_millis(BLOCK_PERIOD_MILLIS / 4)).await;
+        tokio::time::sleep(BLOCK_PERIOD / 4).await;
     }
 }
 
 async fn head_loop() {
     // Wait for some blocks.
-    tokio::time::sleep(tokio::time::Duration::from_millis(BLOCK_PERIOD_MILLIS * 2)).await;
+    tokio::time::sleep(BLOCK_PERIOD * 2).await;
     loop {
         // Get the head block from the sequencer.
         match reqwest::get(&format!("http://{}/", SEQUENCER_URL)).await {
@@ -92,7 +92,7 @@ async fn head_loop() {
                 println!("Error getting head block: {:?}", e);
             }
         }
-        tokio::time::sleep(tokio::time::Duration::from_millis(BLOCK_PERIOD_MILLIS)).await;
+        tokio::time::sleep(BLOCK_PERIOD).await;
     }
 }