diff --git a/tests/common/config_reload.py b/tests/common/config_reload.py
index 5916a63b2bf..b522a343b9e 100644
--- a/tests/common/config_reload.py
+++ b/tests/common/config_reload.py
@@ -192,7 +192,7 @@ def _config_reload_cmd_wrapper(cmd, executable):
         sonic_host.shell(cmd, executable="/bin/bash")
 
     modular_chassis = sonic_host.get_facts().get("modular_chassis")
-    wait = max(wait, 900) if modular_chassis else wait
+    wait = max(wait, 600) if modular_chassis else wait
 
     if safe_reload:
         # The wait time passed in might not be guaranteed to cover the actual
diff --git a/tests/common/plugins/sanity_check/checks.py b/tests/common/plugins/sanity_check/checks.py
index 0c786811839..83299323bc9 100644
--- a/tests/common/plugins/sanity_check/checks.py
+++ b/tests/common/plugins/sanity_check/checks.py
@@ -110,7 +110,7 @@ def _check_interfaces_on_dut(*args, **kwargs):
         networking_uptime = dut.get_networking_uptime().seconds
         timeout = max((SYSTEM_STABILIZE_MAX_TIME - networking_uptime), 0)
         if dut.get_facts().get("modular_chassis"):
-            timeout = max(timeout, 900)
+            timeout = max(timeout, 600)
         interval = 20
         logger.info("networking_uptime=%d seconds, timeout=%d seconds, interval=%d seconds" %
                     (networking_uptime, timeout, interval))
@@ -259,7 +259,7 @@ def _check_bgp_status_helper():
         else:
             max_timeout = SYSTEM_STABILIZE_MAX_TIME - networking_uptime + 480
         if dut.get_facts().get("modular_chassis"):
-            max_timeout = max(max_timeout, 900)
+            max_timeout = max(max_timeout, 600)
         timeout = max(max_timeout, 1)
         interval = 20
         wait_until(timeout, interval, 0, _check_bgp_status_helper)
diff --git a/tests/common/reboot.py b/tests/common/reboot.py
index 7115869827f..aabc9bf4280 100644
--- a/tests/common/reboot.py
+++ b/tests/common/reboot.py
@@ -258,8 +258,8 @@ def reboot(duthost, localhost, reboot_type='cold', delay=10,
         if warmboot_finalizer_timeout == 0 and 'warmboot_finalizer_timeout' in reboot_ctrl:
             warmboot_finalizer_timeout = reboot_ctrl['warmboot_finalizer_timeout']
         if duthost.get_facts().get("modular_chassis") and safe_reboot:
-            wait = max(wait, 900)
-            timeout = max(timeout, 600)
+            wait = max(wait, 600)
+            timeout = max(timeout, 420)
     except KeyError:
         raise ValueError('invalid reboot type: "{} for {}"'.format(reboot_type, hostname))
     logger.info('Reboot {}: wait[{}], timeout[{}]'.format(hostname, wait, timeout))
diff --git a/tests/tacacs/test_ro_disk.py b/tests/tacacs/test_ro_disk.py
index 65dc5ee0bc7..d6d1c23cbb2 100644
--- a/tests/tacacs/test_ro_disk.py
+++ b/tests/tacacs/test_ro_disk.py
@@ -104,8 +104,8 @@ def do_reboot(duthost, localhost, duthosts):
 def post_reboot_healthcheck(duthost, localhost, duthosts, wait_time):
     timeout = 300
     if duthost.get_facts().get("modular_chassis"):
-        wait_time = max(wait_time, 900)
-        timeout = max(timeout, 600)
+        wait_time = max(wait_time, 600)
+        timeout = max(timeout, 420)
         localhost.wait_for(host=duthost.mgmt_ip, port=22, state="started", delay=10, timeout=timeout)
     else:
         localhost.wait_for(host=duthost.mgmt_ip, port=22, state="started", delay=10, timeout=timeout)