diff --git a/polkadot/runtime/src/lib.rs b/polkadot/runtime/src/lib.rs
index 73df55cc43..54562b1f87 100644
--- a/polkadot/runtime/src/lib.rs
+++ b/polkadot/runtime/src/lib.rs
@@ -278,8 +278,10 @@ impl session::historical::Trait for Runtime {
 }
 
 parameter_types! {
+	// Six sessions in an era (24 hours).
 	pub const SessionsPerEra: SessionIndex = 6;
-	pub const BondingDuration: staking::EraIndex = 24 * 28;
+	// 28 eras for unbonding (28 days).
+	pub const BondingDuration: staking::EraIndex = 28;
 }
 
 impl staking::Trait for Runtime {
diff --git a/polkadot/runtime/src/parachains.rs b/polkadot/runtime/src/parachains.rs
index f0a33f6af7..939132cd4d 100644
--- a/polkadot/runtime/src/parachains.rs
+++ b/polkadot/runtime/src/parachains.rs
@@ -1005,7 +1005,7 @@ mod tests {
 
 	parameter_types! {
 		pub const SessionsPerEra: sr_staking_primitives::SessionIndex = 6;
-		pub const BondingDuration: staking::EraIndex = 24 * 28;
+		pub const BondingDuration: staking::EraIndex = 28;
 		pub const AttestationPeriod: BlockNumber = 100;
 	}