diff --git a/tests/scripts/thread-cert/test_mle_msg_key_seq_jump.py b/tests/scripts/thread-cert/test_mle_msg_key_seq_jump.py
index 3140d09d1..90f1b2e26 100755
--- a/tests/scripts/thread-cert/test_mle_msg_key_seq_jump.py
+++ b/tests/scripts/thread-cert/test_mle_msg_key_seq_jump.py
@@ -136,20 +136,21 @@ class MleMsgKeySeqJump(thread_cert.TestCase):
         # re-establish link again (using authoritative exchanges). Validate
         # that all nodes are using the new key seq.
 
-        self.simulator.go(40)
+        self.simulator.go(52)
         for node in nodes:
             self.assertEqual(node.get_key_sequence_counter(), 5)
 
         #-------------------------------------------------------------------
-        # Manually increase the key seq on leader. Wait for advertisement
-        # interval. This would trigger both reed and router to notice key
-        # seq jump and try to re-establish link (link request/accept exchange).
-        # Validate that they all adopt the new key seq.
+        # Manually increase the key seq on leader. Wait for max time between
+        # advertisements. This would trigger both reed and router
+        # to notice key seq jump and try to re-establish link (link
+        # request/accept exchange). Validate that they all adopt the new
+        # key seq.
 
         leader.set_key_sequence_counter(10)
         self.assertEqual(leader.get_key_sequence_counter(), 10)
 
-        self.simulator.go(40)
+        self.simulator.go(52)
 
         self.assertEqual(router.get_key_sequence_counter(), 10)
         self.assertEqual(reed.get_key_sequence_counter(), 10)
@@ -220,14 +221,14 @@ class MleMsgKeySeqJump(thread_cert.TestCase):
         self.assertEqual(reed.get_key_sequence_counter(), 20)
 
         #-------------------------------------------------------------------
-        # Move forward the key seq counter by one on router. Wait for
-        # advertisement interval. Validate that leader adopts the higher
+        # Move forward the key seq counter by one on router. Wait for max
+        # time between advertisements. Validate that leader adopts the higher
         # counter value.
 
         router.set_key_sequence_counter(21)
         self.assertEqual(router.get_key_sequence_counter(), 21)
 
-        self.simulator.go(40)
+        self.simulator.go(52)
         self.assertEqual(leader.get_key_sequence_counter(), 21)
         self.assertEqual(reed.get_key_sequence_counter(), 21)