diff --git a/tests/scripts/thread-cert/border_router/test_nat64_multi_border_routers.py b/tests/scripts/thread-cert/border_router/test_nat64_multi_border_routers.py
index f139836f5..c09383604 100644
--- a/tests/scripts/thread-cert/border_router/test_nat64_multi_border_routers.py
+++ b/tests/scripts/thread-cert/border_router/test_nat64_multi_border_routers.py
@@ -105,6 +105,7 @@ class Nat64MultiBorderRouter(thread_cert.TestCase):
         self.assertEqual('router', br2.get_state())
 
         # Only 1 NAT64 prefix in Network Data.
+        self.simulator.go(30)
         self.assertEqual(len(br1.get_netdata_nat64_prefix()), 1)
         self.assertEqual(len(br2.get_netdata_nat64_prefix()), 1)
         self.assertEqual(br1.get_netdata_nat64_prefix()[0], br2.get_netdata_nat64_prefix()[0])
@@ -120,7 +121,7 @@ class Nat64MultiBorderRouter(thread_cert.TestCase):
         # Case 2. Disable and re-enable border routing on BR1.
         #
         br1.disable_br()
-        self.simulator.go(5)
+        self.simulator.go(30)
 
         # BR1 withdraws its prefix and BR2 advertises its prefix.
         self.assertEqual(len(br1.get_netdata_nat64_prefix()), 1)
@@ -128,7 +129,7 @@ class Nat64MultiBorderRouter(thread_cert.TestCase):
         self.assertNotEqual(br1_nat64_prefix, br1.get_netdata_nat64_prefix()[0])
 
         br1.enable_br()
-        self.simulator.go(5)
+        self.simulator.go(30)
 
         # NAT64 prefix in Network Data is still advertised by BR2.
         self.assertEqual(len(br1.get_netdata_nat64_prefix()), 1)