diff --git a/lib/core/src/Cardano/Wallet.hs b/lib/core/src/Cardano/Wallet.hs
index 5f465987d1a..3139be77bc1 100644
--- a/lib/core/src/Cardano/Wallet.hs
+++ b/lib/core/src/Cardano/Wallet.hs
@@ -546,7 +546,7 @@ newWalletLayer
         -> BlockHeader
         -> IO ()
     restoreSleep t wid slot =
-        let halfSlotLengthDelay = fromIntegral $ (diffTimeToPicoseconds slotLength `div` 500000) in do
+        let halfSlotLengthDelay = fromIntegral (diffTimeToPicoseconds slotLength `div` 2000000) in do
             threadDelay halfSlotLengthDelay
             runExceptT (networkTip nw) >>= \case
                 Left e -> do
diff --git a/lib/jormungandr/cardano-wallet-jormungandr.cabal b/lib/jormungandr/cardano-wallet-jormungandr.cabal
index 55ad8b1c9ab..3ae16c1340b 100644
--- a/lib/jormungandr/cardano-wallet-jormungandr.cabal
+++ b/lib/jormungandr/cardano-wallet-jormungandr.cabal
@@ -96,6 +96,7 @@ test-suite unit
     , QuickCheck
     , text
     , text-class
+    , time
     , transformers
   build-tools:
       hspec-discover
diff --git a/lib/jormungandr/test/integration/Main.hs b/lib/jormungandr/test/integration/Main.hs
index 37eb302f715..19fd0893498 100644
--- a/lib/jormungandr/test/integration/Main.hs
+++ b/lib/jormungandr/test/integration/Main.hs
@@ -36,14 +36,12 @@ import Cardano.Wallet.Jormungandr.Compatibility
     ( Jormungandr, Network (..) )
 import Cardano.Wallet.Jormungandr.Network
     ( BaseUrl (..), JormungandrLayer (..), Scheme (..), mkJormungandrLayer )
-import Cardano.Wallet.Jormungandr.Primitive.Types
-    ( Tx (..) )
 import Cardano.Wallet.Network
     ( NetworkLayer (..), defaultRetryPolicy, waitForConnection )
 import Cardano.Wallet.Primitive.Fee
     ( FeePolicy (..) )
 import Cardano.Wallet.Primitive.Types
-    ( Block (..), Hash (..), SlotLength )
+    ( Hash (..) )
 import Cardano.Wallet.Unsafe
     ( unsafeFromHex, unsafeRunExceptT )
 import Control.Concurrent
@@ -182,7 +180,8 @@ cardanoWalletServer
 cardanoWalletServer mlisten = do
     logConfig <- CM.empty
     tracer <- initTracer Info "serve"
-    (nl, bp) <- newNetworkLayer jormungandrUrl block0H
+    (nl, bp@(BlockchainParameters _ feePolicy _) ) <-
+         newNetworkLayer jormungandrUrl block0H
     (sqlCtx, db) <- Sqlite.newDBLayer @_ @network logConfig tracer Nothing
     mvar <- newEmptyMVar
     handle <- async $ do
@@ -206,17 +205,15 @@ cardanoWalletServer mlisten = do
 newNetworkLayer
     :: BaseUrl
     -> Hash "Genesis"
-    -> IO (NetworkLayer (Jormungandr n) IO, Block Tx, FeePolicy, SlotLength)
+    -> IO (NetworkLayer (Jormungandr n) IO, BlockchainParameters (Jormungandr n))
 newNetworkLayer url block0H = do
     mgr <- newManager defaultManagerSettings
     let jormungandr = mkJormungandrLayer mgr url
     let nl = Jormungandr.mkNetworkLayer jormungandr
     waitForConnection nl defaultRetryPolicy
-    block0 <- unsafeRunExceptT $
-        getBlock jormungandr (coerce block0H)
-    (feePolicy, slotLength) <- unsafeRunExceptT $
+    blockchainParams <- unsafeRunExceptT $
         getInitialBlockchainParameters jormungandr (coerce block0H)
-    return (nl, block0, feePolicy, slotLength)
+    return (nl, blockchainParams)
 
 mkFeeEstimator :: FeePolicy -> TxDescription -> (Natural, Natural)
 mkFeeEstimator policy (TxDescription nInps nOuts) =
diff --git a/lib/jormungandr/test/unit/Cardano/Wallet/Jormungandr/BinarySpec.hs b/lib/jormungandr/test/unit/Cardano/Wallet/Jormungandr/BinarySpec.hs
index d17798d4bf1..e095ad1f0d1 100644
--- a/lib/jormungandr/test/unit/Cardano/Wallet/Jormungandr/BinarySpec.hs
+++ b/lib/jormungandr/test/unit/Cardano/Wallet/Jormungandr/BinarySpec.hs
@@ -64,6 +64,8 @@ import Data.Proxy
     ( Proxy (..) )
 import Data.Quantity
     ( Quantity (..) )
+import Data.Time.Clock
+    ( secondsToDiffTime )
 import Data.Word
     ( Word8 )
 import GHC.Generics
@@ -120,7 +122,7 @@ spec = do
                         , Discrimination Testnet
                         , Consensus BFT
                         , SlotsPerEpoch (Quantity 2160)
-                        , SlotDuration (Quantity 15)
+                        , SlotDuration (secondsToDiffTime 15)
                         , EpochStabilityDepth (Quantity 10)
                         , AddBftLeader $ LeaderId $ unsafeFromHex
                             "30a694b80dbba2d1b8a4b55652b03d96\
@@ -173,7 +175,7 @@ spec = do
                         , Discrimination Mainnet
                         , Consensus BFT
                         , SlotsPerEpoch (Quantity 500)
-                        , SlotDuration (Quantity 10)
+                        , SlotDuration (secondsToDiffTime 10)
                         , EpochStabilityDepth (Quantity 10)
                         , AddBftLeader $ LeaderId $ unsafeFromHex
                             "b216ee388fc25596cf43fbca815c463c\
diff --git a/nix/.stack.nix/cardano-wallet-jormungandr.nix b/nix/.stack.nix/cardano-wallet-jormungandr.nix
index 70b54f944ac..02b11fe4855 100644
--- a/nix/.stack.nix/cardano-wallet-jormungandr.nix
+++ b/nix/.stack.nix/cardano-wallet-jormungandr.nix
@@ -65,6 +65,7 @@
             (hsPkgs.QuickCheck)
             (hsPkgs.text)
             (hsPkgs.text-class)
+            (hsPkgs.time)
             (hsPkgs.transformers)
             ];
           build-tools = [
@@ -113,4 +114,4 @@
           };
         };
       };
-    } // rec { src = (pkgs.lib).mkDefault ../.././lib/jormungandr; }
\ No newline at end of file
+    } // rec { src = (pkgs.lib).mkDefault ../.././lib/jormungandr; }