diff --git a/cumulus/parachains/runtimes/glutton/glutton-westend/src/lib.rs b/cumulus/parachains/runtimes/glutton/glutton-westend/src/lib.rs
index bcddf5f62e35..be58656b7b22 100644
--- a/cumulus/parachains/runtimes/glutton/glutton-westend/src/lib.rs
+++ b/cumulus/parachains/runtimes/glutton/glutton-westend/src/lib.rs
@@ -188,6 +188,22 @@ const BLOCK_PROCESSING_VELOCITY: u32 = 3;
 /// into the relay chain.
 const UNINCLUDED_SEGMENT_CAPACITY: u32 = (3 + RELAY_PARENT_OFFSET) * BLOCK_PROCESSING_VELOCITY;
 
+/// Enables V3 scheduling while accepting any scheduling signature, like the
+/// `cumulus-test-runtime` `v3-descriptor` flavor does. Glutton is a testing-only
+/// runtime, so signature verification adds nothing here.
+pub struct SchedulingV3AcceptAll;
+
+impl VerifySchedulingSignature for SchedulingV3AcceptAll {
+	const V3_SCHEDULING_ENABLED: bool = true;
+
+	fn verify(
+		_signed_info: &cumulus_primitives_core::SignedSchedulingInfo,
+		_internal_scheduling_parent_header: &cumulus_primitives_core::relay_chain::Header,
+	) -> bool {
+		true
+	}
+}
+
 type ConsensusHook = cumulus_pallet_aura_ext::FixedVelocityConsensusHook<
 	Runtime,
 	RELAY_CHAIN_SLOT_DURATION_MILLIS,
@@ -208,7 +224,7 @@ impl cumulus_pallet_parachain_system::Config for Runtime {
 	type ConsensusHook = ConsensusHook;
 	type WeightInfo = weights::cumulus_pallet_parachain_system::WeightInfo<Runtime>;
 	type RelayParentOffset = ConstU32<RELAY_PARENT_OFFSET>;
-	type SchedulingSignatureVerifier = ();
+	type SchedulingSignatureVerifier = SchedulingV3AcceptAll;
 }
 
 parameter_types! {
diff --git a/cumulus/parachains/runtimes/testing/yet-another-parachain/src/lib.rs b/cumulus/parachains/runtimes/testing/yet-another-parachain/src/lib.rs
index f221fb62da5a..c5feacb73157 100644
--- a/cumulus/parachains/runtimes/testing/yet-another-parachain/src/lib.rs
+++ b/cumulus/parachains/runtimes/testing/yet-another-parachain/src/lib.rs
@@ -153,6 +153,22 @@ const BLOCK_PROCESSING_VELOCITY: u32 = 12;
 /// Relay chain slot duration, in milliseconds.
 const RELAY_CHAIN_SLOT_DURATION_MILLIS: u32 = 6000;
 
+/// Enables V3 scheduling while accepting any scheduling signature, like the
+/// `cumulus-test-runtime` `v3-descriptor` flavor does. YAP is a testing-only
+/// runtime, so signature verification adds nothing here.
+pub struct SchedulingV3AcceptAll;
+
+impl VerifySchedulingSignature for SchedulingV3AcceptAll {
+	const V3_SCHEDULING_ENABLED: bool = true;
+
+	fn verify(
+		_signed_info: &cumulus_primitives_core::SignedSchedulingInfo,
+		_internal_scheduling_parent_header: &cumulus_primitives_core::relay_chain::Header,
+	) -> bool {
+		true
+	}
+}
+
 parameter_types! {
 	pub const BlockHashCount: BlockNumber = 250;
 	pub const Version: RuntimeVersion = VERSION;
@@ -373,7 +389,7 @@ impl cumulus_pallet_parachain_system::Config for Runtime {
 	type CheckAssociatedRelayNumber = RelayNumberMonotonicallyIncreases;
 	type ConsensusHook = ConsensusHook;
 	type RelayParentOffset = ConstU32<RELAY_PARENT_OFFSET>;
-	type SchedulingSignatureVerifier = ();
+	type SchedulingSignatureVerifier = SchedulingV3AcceptAll;
 }
 
 impl pallet_message_queue::Config for Runtime {
diff --git a/polkadot/runtime/westend/constants/src/lib.rs b/polkadot/runtime/westend/constants/src/lib.rs
index df5dc57c8a5f..0a0d59d18ea4 100644
--- a/polkadot/runtime/westend/constants/src/lib.rs
+++ b/polkadot/runtime/westend/constants/src/lib.rs
@@ -42,7 +42,7 @@ pub mod time {
 
 	pub const MILLISECS_PER_BLOCK: Moment = 6000;
 	pub const SLOT_DURATION: Moment = MILLISECS_PER_BLOCK;
-	pub const EPOCH_DURATION_IN_SLOTS: BlockNumber = prod_or_fast!(1 * HOURS, 1 * MINUTES);
+	pub const EPOCH_DURATION_IN_SLOTS: BlockNumber = prod_or_fast!(1 * HOURS, 10 * MINUTES);
 
 	// These time units are defined in number of blocks.
 	pub const MINUTES: BlockNumber = 60_000 / (MILLISECS_PER_BLOCK as BlockNumber);
diff --git a/polkadot/runtime/westend/src/lib.rs b/polkadot/runtime/westend/src/lib.rs
index c90891f14930..a81601a538f8 100644
--- a/polkadot/runtime/westend/src/lib.rs
+++ b/polkadot/runtime/westend/src/lib.rs
@@ -348,7 +348,9 @@ impl pallet_preimage::Config for Runtime {
 parameter_types! {
 	pub const EpochDuration: u64 = prod_or_fast!(
 		EPOCH_DURATION_IN_SLOTS as u64,
-		2 * MINUTES as u64
+		// 100-slot (10-minute) sessions for versi, matching the historical
+		// westend-100 runtime the network ran before.
+		10 * MINUTES as u64
 	);
 	pub const ExpectedBlockTime: Moment = MILLISECS_PER_BLOCK;
 	pub const ReportLongevity: u64 =
@@ -571,11 +573,11 @@ parameter_types! {
 	// phase durations. 1/4 of the last session for each.
 	pub SignedPhase: u32 = prod_or_fast!(
 		EPOCH_DURATION_IN_SLOTS / 4,
-		(1 * MINUTES).min(EpochDuration::get().saturated_into::<u32>() / 2)
+		(10 * MINUTES).min(EpochDuration::get().saturated_into::<u32>() / 2)
 	);
 	pub UnsignedPhase: u32 = prod_or_fast!(
 		EPOCH_DURATION_IN_SLOTS / 4,
-		(1 * MINUTES).min(EpochDuration::get().saturated_into::<u32>() / 2)
+		(10 * MINUTES).min(EpochDuration::get().saturated_into::<u32>() / 2)
 	);
 
 	// signed config