diff --git a/test/case/ntp/server_client/test.py b/test/case/ntp/server_client/test.py
index fd3de100..fb525fa5 100755
--- a/test/case/ntp/server_client/test.py
+++ b/test/case/ntp/server_client/test.py
@@ -87,11 +87,11 @@ with infamy.Test() as test:
         })
 
     with test.step("Verify NTP server has received packets"):
-        until(lambda: ntp.server_has_received_packets(server), attempts=30)
+        until(lambda: ntp.server_has_received_packets(server), attempts=120)
         print("Server has received NTP packets from client")
 
     with test.step("Verify NTP client has synchronized"):
-        selected = until(lambda: ntp.any_source_selected(client), attempts=30)
+        selected = until(lambda: ntp.any_source_selected(client), attempts=120)
         print(f"Client synchronized to {selected.get('address')} (stratum {selected.get('stratum')})")
 
     test.succeed()
diff --git a/test/case/ntp/server_mode_peer/test.py b/test/case/ntp/server_mode_peer/test.py
index 68f02448..9b4c790b 100755
--- a/test/case/ntp/server_mode_peer/test.py
+++ b/test/case/ntp/server_mode_peer/test.py
@@ -97,12 +97,12 @@ with infamy.Test() as test:
 
     with test.step("Verify peers see each other in associations"):
         for dut, _, name, _, peer_ip in duts:
-            until(lambda t=dut, p=peer_ip: ntp.server_has_peer(t, p), attempts=20)
+            until(lambda t=dut, p=peer_ip: ntp.server_has_peer(t, p), attempts=120)
             print(f"{name} sees {peer_ip} in associations")
 
     with test.step("Verify peers can reach each other"):
         for dut, _, name, _, peer_ip in duts:
-            until(lambda t=dut, p=peer_ip: ntp.server_peer_reachable(t, p), attempts=60)
+            until(lambda t=dut, p=peer_ip: ntp.server_peer_reachable(t, p), attempts=120)
             print(f"{name} can reach {peer_ip}")
 
     with test.step("Wait for one peer to select the other as sync source"):
diff --git a/test/case/ntp/server_mode_server/test.py b/test/case/ntp/server_mode_server/test.py
index 46ccbe2c..4fc3bd99 100755
--- a/test/case/ntp/server_mode_server/test.py
+++ b/test/case/ntp/server_mode_server/test.py
@@ -115,10 +115,10 @@ with infamy.Test() as test:
             ns1.must_reach("192.168.1.1")
 
         with test.step("Query time from upstream NTP server"):
-            until(lambda: ntp.server_query(ns1, "192.168.1.1"), attempts=20)
+            until(lambda: ntp.server_query(ns1, "192.168.1.1"), attempts=120)
 
         with test.step("Verify upstream NTP server statistics"):
-            until(lambda: ntp.server_has_received_packets(upstream), attempts=20)
+            until(lambda: ntp.server_has_received_packets(upstream), attempts=120)
 
     with infamy.IsolatedMacVlan(hport2) as ns2:
         ns2.addip("192.168.2.2")
@@ -128,9 +128,9 @@ with infamy.Test() as test:
 
         with test.step("Wait for downstream to sync from upstream"):
             # Give downstream time to sync from upstream
-            until(lambda: ntp.server_query(ns2, "192.168.2.1"), attempts=30)
+            until(lambda: ntp.server_query(ns2, "192.168.2.1"), attempts=120)
 
         with test.step("Verify downstream NTP server statistics"):
-            until(lambda: ntp.server_has_received_packets(downstream), attempts=20)
+            until(lambda: ntp.server_has_received_packets(downstream), attempts=120)
 
     test.succeed()
diff --git a/test/case/ntp/server_mode_standalone/test.py b/test/case/ntp/server_mode_standalone/test.py
index 57b78fbd..2ed808ed 100755
--- a/test/case/ntp/server_mode_standalone/test.py
+++ b/test/case/ntp/server_mode_standalone/test.py
@@ -53,9 +53,9 @@ with infamy.Test() as test:
             ns1.must_reach("192.168.1.1")
 
         with test.step("Query time from NTP server"):
-            until(lambda: ntp.server_query(ns1, "192.168.1.1"), attempts=20)
+            until(lambda: ntp.server_query(ns1, "192.168.1.1"), attempts=120)
 
         with test.step("Verify NTP server statistics"):
-            until(lambda: ntp.server_has_received_packets(target), attempts=20)
+            until(lambda: ntp.server_has_received_packets(target), attempts=120)
 
     test.succeed()