diff --git a/op-chain-ops/interopgen/recipe.go b/op-chain-ops/interopgen/recipe.go
index 5c1d4ffac940a..6cf3265925c4d 100644
--- a/op-chain-ops/interopgen/recipe.go
+++ b/op-chain-ops/interopgen/recipe.go
@@ -14,11 +14,13 @@ import (
 
 type InteropDevRecipe struct {
 	L1ChainID        uint64
-	L2ChainIDs       []uint64
+	L2s              []InteropDevL2Recipe
 	GenesisTimestamp uint64
 }
 
-func (r *InteropDevRecipe) Build(addrs devkeys.Addresses) (*WorldConfig, error) {
+func (recipe *InteropDevRecipe) Build(addrs devkeys.Addresses) (*WorldConfig, error) {
+	r := recipe.hydrated()
+
 	// L1 genesis
 	l1Cfg := &L1Config{
 		ChainID: new(big.Int).SetUint64(r.L1ChainID),
@@ -88,19 +90,41 @@ func (r *InteropDevRecipe) Build(addrs devkeys.Addresses) (*WorldConfig, error)
 		Superchain: superchainCfg,
 		L2s:        make(map[string]*L2Config),
 	}
-	for _, l2ChainID := range r.L2ChainIDs {
-		l2Cfg, err := InteropL2DevConfig(r.L1ChainID, l2ChainID, addrs)
+	for _, l2 := range r.L2s {
+		l2Cfg, err := l2.build(r.L1ChainID, addrs)
 		if err != nil {
-			return nil, fmt.Errorf("failed to generate L2 config for chain %d: %w", l2ChainID, err)
+			return nil, fmt.Errorf("failed to generate L2 config for chain %d: %w", l2.ChainID, err)
 		}
 		if err := prefundL2Accounts(l1Cfg, l2Cfg, addrs); err != nil {
-			return nil, fmt.Errorf("failed to prefund addresses on L1 for L2 chain %d: %w", l2ChainID, err)
+			return nil, fmt.Errorf("failed to prefund addresses on L1 for L2 chain %d: %w", l2.ChainID, err)
 		}
-		world.L2s[fmt.Sprintf("%d", l2ChainID)] = l2Cfg
+		world.L2s[fmt.Sprintf("%d", l2.ChainID)] = l2Cfg
 	}
 	return world, nil
 }
 
+func (r *InteropDevRecipe) hydrated() InteropDevRecipe {
+	out := InteropDevRecipe{
+		L1ChainID:        r.L1ChainID,
+		L2s:              make([]InteropDevL2Recipe, len(r.L2s)),
+		GenesisTimestamp: r.GenesisTimestamp,
+	}
+	for i, l := range r.L2s {
+		out.L2s[i] = l
+		if l.BlockTime == 0 {
+			out.L2s[i].BlockTime = defaultBlockTime
+		}
+	}
+	return out
+}
+
+const defaultBlockTime = 2
+
+type InteropDevL2Recipe struct {
+	ChainID   uint64
+	BlockTime uint64
+}
+
 func prefundL2Accounts(l1Cfg *L1Config, l2Cfg *L2Config, addrs devkeys.Addresses) error {
 	l1Cfg.Prefund[l2Cfg.BatchSenderAddress] = Ether(10_000_000)
 	l1Cfg.Prefund[l2Cfg.Deployer] = Ether(10_000_000)
@@ -125,10 +149,10 @@ func prefundL2Accounts(l1Cfg *L1Config, l2Cfg *L2Config, addrs devkeys.Addresses
 	return nil
 }
 
-func InteropL2DevConfig(l1ChainID, l2ChainID uint64, addrs devkeys.Addresses) (*L2Config, error) {
+func (r *InteropDevL2Recipe) build(l1ChainID uint64, addrs devkeys.Addresses) (*L2Config, error) {
 	// Padded chain ID, hex encoded, prefixed with 0xff like inboxes, then 0x02 to signify devnet.
-	batchInboxAddress := common.HexToAddress(fmt.Sprintf("0xff02%016x", l2ChainID))
-	chainOps := devkeys.ChainOperatorKeys(new(big.Int).SetUint64(l2ChainID))
+	batchInboxAddress := common.HexToAddress(fmt.Sprintf("0xff02%016x", r.ChainID))
+	chainOps := devkeys.ChainOperatorKeys(new(big.Int).SetUint64(r.ChainID))
 
 	deployer, err := addrs.Address(chainOps(devkeys.DeployerRole))
 	if err != nil {
@@ -238,8 +262,8 @@ func InteropL2DevConfig(l1ChainID, l2ChainID uint64, addrs devkeys.Addresses) (*
 			},
 			L2CoreDeployConfig: genesis.L2CoreDeployConfig{
 				L1ChainID:                 l1ChainID,
-				L2ChainID:                 l2ChainID,
-				L2BlockTime:               2,
+				L2ChainID:                 r.ChainID,
+				L2BlockTime:               r.BlockTime,
 				FinalizationPeriodSeconds: 2, // instant output finalization
 				MaxSequencerDrift:         300,
 				SequencerWindowSize:       200,
@@ -262,7 +286,7 @@ func InteropL2DevConfig(l1ChainID, l2ChainID uint64, addrs devkeys.Addresses) (*
 		DisputeMaxClockDuration: 302400, // 3.5 days (input in seconds)
 	}
 
-	l2Users := devkeys.ChainUserKeys(new(big.Int).SetUint64(l2ChainID))
+	l2Users := devkeys.ChainUserKeys(new(big.Int).SetUint64(r.ChainID))
 	for i := uint64(0); i < 20; i++ {
 		userAddr, err := addrs.Address(l2Users(i))
 		if err != nil {
diff --git a/op-e2e/actions/interop/dsl/dsl.go b/op-e2e/actions/interop/dsl/dsl.go
index 6c5ca36a3c4b8..cf123c13cdea9 100644
--- a/op-e2e/actions/interop/dsl/dsl.go
+++ b/op-e2e/actions/interop/dsl/dsl.go
@@ -62,8 +62,8 @@ type InteropDSL struct {
 	createdUsers uint64
 }
 
-func NewInteropDSL(t helpers.Testing) *InteropDSL {
-	setup := SetupInterop(t)
+func NewInteropDSL(t helpers.Testing, opts ...setupOption) *InteropDSL {
+	setup := SetupInterop(t, opts...)
 	actors := setup.CreateActors()
 	actors.PrepareChainState(t)
 
diff --git a/op-e2e/actions/interop/dsl/interop.go b/op-e2e/actions/interop/dsl/interop.go
index 48bdde8e68257..dec5aff6300f9 100644
--- a/op-e2e/actions/interop/dsl/interop.go
+++ b/op-e2e/actions/interop/dsl/interop.go
@@ -103,15 +103,32 @@ func (actors *InteropActors) PrepareChainState(t helpers.Testing) {
 // At a 2 second block time, this should be small enough to cover all events buffered in the supervisor event queue.
 const messageExpiryTime = 120 // 2 minutes
 
-// SetupInterop creates an InteropSetup to instantiate actors on, with 2 L2 chains.
-func SetupInterop(t helpers.Testing) *InteropSetup {
-	logger := testlog.Logger(t, log.LevelDebug)
+type setupOption func(*interopgen.InteropDevRecipe)
+
+func SetBlockTimeForChainA(blockTime uint64) setupOption {
+	return func(recipe *interopgen.InteropDevRecipe) {
+		recipe.L2s[0].BlockTime = blockTime
+	}
+}
+
+func SetBlockTimeForChainB(blockTime uint64) setupOption {
+	return func(recipe *interopgen.InteropDevRecipe) {
+		recipe.L2s[1].BlockTime = blockTime
+	}
+}
 
+// SetupInterop creates an InteropSetup to instantiate actors on, with 2 L2 chains.
+func SetupInterop(t helpers.Testing, opts ...setupOption) *InteropSetup {
 	recipe := interopgen.InteropDevRecipe{
 		L1ChainID:        900100,
-		L2ChainIDs:       []uint64{900200, 900201},
+		L2s:              []interopgen.InteropDevL2Recipe{{ChainID: 900200}, {ChainID: 900201}},
 		GenesisTimestamp: uint64(time.Now().Unix() + 3),
 	}
+	for _, opt := range opts {
+		opt(&recipe)
+	}
+
+	logger := testlog.Logger(t, log.LevelDebug)
 	hdWallet, err := devkeys.NewMnemonicDevKeys(devkeys.TestMnemonic)
 	require.NoError(t, err)
 	worldCfg, err := recipe.Build(hdWallet)
diff --git a/op-e2e/actions/interop/proofs_test.go b/op-e2e/actions/interop/proofs_test.go
index cc6b88881a86b..dc700c8972c6c 100644
--- a/op-e2e/actions/interop/proofs_test.go
+++ b/op-e2e/actions/interop/proofs_test.go
@@ -769,6 +769,19 @@ func TestInteropFaultProofsInvalidBlock(gt *testing.T) {
 	runFppAndChallengerTests(gt, system, tests)
 }
 
+func TestInteropFaultProofs_VariedBlockTimes(gt *testing.T) {
+	t := helpers.NewDefaultTesting(gt)
+	system := dsl.NewInteropDSL(t, dsl.SetBlockTimeForChainA(1), dsl.SetBlockTimeForChainB(2))
+	actors := system.Actors
+
+	system.AddL2Block(system.Actors.ChainA)
+	system.AddL2Block(system.Actors.ChainB)
+
+	assertTime(t, actors.ChainA, 1, 1, 0, 0)
+	assertTime(t, actors.ChainB, 2, 2, 0, 0)
+	// TODO(#14479): Complete test case
+}
+
 func runFppAndChallengerTests(gt *testing.T, system *dsl.InteropDSL, tests []*transitionTest) {
 	for _, test := range tests {
 		test := test
@@ -873,6 +886,15 @@ func WithInteropEnabled(t helpers.StatefulTesting, actors *dsl.InteropActors, de
 	}
 }
 
+func assertTime(t helpers.Testing, chain *dsl.Chain, unsafe, crossUnsafe, localSafe, safe uint64) {
+	start := chain.L2Genesis.Timestamp
+	status := chain.Sequencer.SyncStatus()
+	require.Equal(t, start+unsafe, status.UnsafeL2.Time, "Unsafe")
+	require.Equal(t, start+crossUnsafe, status.CrossUnsafeL2.Time, "Cross Unsafe")
+	require.Equal(t, start+localSafe, status.LocalSafeL2.Time, "Local safe")
+	require.Equal(t, start+safe, status.SafeL2.Time, "Safe")
+}
+
 type transitionTest struct {
 	name               string
 	agreedClaim        []byte
diff --git a/op-e2e/faultproofs/util_interop.go b/op-e2e/faultproofs/util_interop.go
index 29afb3bc6d099..0f9aa3b7b1fa2 100644
--- a/op-e2e/faultproofs/util_interop.go
+++ b/op-e2e/faultproofs/util_interop.go
@@ -21,7 +21,7 @@ func StartInteropFaultDisputeSystem(t *testing.T, opts ...faultDisputeConfigOpts
 	}
 	recipe := interopgen.InteropDevRecipe{
 		L1ChainID:        900100,
-		L2ChainIDs:       []uint64{900200, 900201},
+		L2s:              []interopgen.InteropDevL2Recipe{{ChainID: 900200}, {ChainID: 900201}},
 		GenesisTimestamp: uint64(time.Now().Unix() + 3), // start chain 3 seconds from now
 	}
 	worldResources := interop.WorldResourcePaths{
diff --git a/op-e2e/interop/interop_recipe_test.go b/op-e2e/interop/interop_recipe_test.go
index 05a2e056c39b7..038460668c61c 100644
--- a/op-e2e/interop/interop_recipe_test.go
+++ b/op-e2e/interop/interop_recipe_test.go
@@ -18,7 +18,7 @@ import (
 func TestInteropDevRecipe(t *testing.T) {
 	rec := interopgen.InteropDevRecipe{
 		L1ChainID:        900100,
-		L2ChainIDs:       []uint64{900200, 900201},
+		L2s:              []interopgen.InteropDevL2Recipe{{ChainID: 900200}, {ChainID: 900201}},
 		GenesisTimestamp: uint64(1234567),
 	}
 	hd, err := devkeys.NewMnemonicDevKeys(devkeys.TestMnemonic)
diff --git a/op-e2e/interop/interop_test.go b/op-e2e/interop/interop_test.go
index 67013947f2780..6ae812f1609a8 100644
--- a/op-e2e/interop/interop_test.go
+++ b/op-e2e/interop/interop_test.go
@@ -34,7 +34,7 @@ import (
 func setupAndRun(t *testing.T, config SuperSystemConfig, fn func(*testing.T, SuperSystem)) {
 	recipe := interopgen.InteropDevRecipe{
 		L1ChainID:        900100,
-		L2ChainIDs:       []uint64{900200, 900201},
+		L2s:              []interopgen.InteropDevL2Recipe{{ChainID: 900200}, {ChainID: 900201}},
 		GenesisTimestamp: uint64(time.Now().Unix() + 3), // start chain 3 seconds from now
 	}
 	worldResources := WorldResourcePaths{
diff --git a/op-node/cmd/interop/interop.go b/op-node/cmd/interop/interop.go
index 3e6f75d530bb0..7b71940ff8102 100644
--- a/op-node/cmd/interop/interop.go
+++ b/op-node/cmd/interop/interop.go
@@ -96,9 +96,14 @@ var InteropDevSetup = &cli.Command{
 		logCfg := oplog.ReadCLIConfig(cliCtx)
 		logger := oplog.NewLogger(cliCtx.App.Writer, logCfg)
 
+		l2ChainIDs := cliCtx.Uint64Slice(l2ChainIDsFlag.Name)
+		l2Recipes := make([]interopgen.InteropDevL2Recipe, len(l2ChainIDs))
+		for i, id := range l2ChainIDs {
+			l2Recipes[i] = interopgen.InteropDevL2Recipe{ChainID: id}
+		}
 		recipe := &interopgen.InteropDevRecipe{
 			L1ChainID:        cliCtx.Uint64(l1ChainIDFlag.Name),
-			L2ChainIDs:       cliCtx.Uint64Slice(l2ChainIDsFlag.Name),
+			L2s:              l2Recipes,
 			GenesisTimestamp: cliCtx.Uint64(timestampFlag.Name),
 		}
 		if recipe.GenesisTimestamp == 0 {