diff --git a/substrate/client/basic-authorship/src/basic_authorship.rs b/substrate/client/basic-authorship/src/basic_authorship.rs
index b3a8f0d897..4ce08cb3f3 100644
--- a/substrate/client/basic-authorship/src/basic_authorship.rs
+++ b/substrate/client/basic-authorship/src/basic_authorship.rs
@@ -292,6 +292,7 @@ where
 			Box::pin(async move {
 				// leave some time for evaluation and block finalization (33%)
 				let deadline = (self.now)() + max_duration - max_duration / 3;
+
 				let res = self
 					.propose_with(inherent_data, inherent_digests, deadline, block_size_limit)
 					.await;
@@ -447,6 +448,7 @@ where
 			};
 
 			let now = (self.now)();
+			debug!(target: LOG_TARGET, "now = {:?}, deadline = {:?}", now, deadline);
 			if now > deadline {
 				debug!(
 					target: LOG_TARGET,
diff --git a/substrate/client/consensus/manual-seal/src/seal_block.rs b/substrate/client/consensus/manual-seal/src/seal_block.rs
index 716e889ec0..78843851af 100644
--- a/substrate/client/consensus/manual-seal/src/seal_block.rs
+++ b/substrate/client/consensus/manual-seal/src/seal_block.rs
@@ -28,10 +28,12 @@ use sp_consensus::{self, BlockOrigin, Environment, Proposer, SelectChain};
 use sp_inherents::{CreateInherentDataProviders, InherentDataProvider};
 use sp_runtime::traits::{Block as BlockT, Header as HeaderT};
 use std::{sync::Arc, time::Duration};
-
+use log::trace;
+use std::time::Instant;
+use std::time;
 /// max duration for creating a proposal in secs
 pub const MAX_PROPOSAL_DURATION: u64 = 10;
-
+const LOG_TARGET: &str = "manual-seal";
 /// params for sealing a new block
 pub struct SealBlockParams<'a, B: BlockT, BI, SC, C: ProvideRuntimeApi<B>, E, TP, CIDP, P> {
 	/// if true, empty blocks(without extrinsics) will be created.
@@ -114,12 +116,19 @@ pub async fn seal_block<B, BI, SC, C, E, TP, CIDP, P>(
 		} else {
 			Default::default()
 		};
+		let max_duration = Duration::from_secs(MAX_PROPOSAL_DURATION);
+		trace!(target: LOG_TARGET, "now = {:?}", time::Instant::now());
+		trace!(target: LOG_TARGET, "max duration = {:?}", max_duration);
+		trace!(target: LOG_TARGET, "max duration * 1/3 = {:?}", max_duration / 3);
+		let deadline = time::Instant::now() + max_duration - max_duration / 3;
+		trace!(target: LOG_TARGET, "deadline = {:?}", deadline);
+
 
 		let proposal = proposer
 			.propose(
 				inherent_data.clone(),
 				digest,
-				Duration::from_secs(MAX_PROPOSAL_DURATION),
+				max_duration,
 				None,
 			)
 			.map_err(|err| Error::StringError(err.to_string()))