--- a/toolkit/components/extensions/test/xpcshell/test_ext_native_messaging_perf.js
+++ b/toolkit/components/extensions/test/xpcshell/test_ext_native_messaging_perf.js
@@ -4,17 +4,17 @@
 
 XPCOMUtils.defineLazyModuleGetter(this, "MockRegistry",
                                   "resource://testing-common/MockRegistry.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "OS",
                                   "resource://gre/modules/osfile.jsm");
 
 Cu.import("resource://gre/modules/Subprocess.jsm");
 
-const MAX_ROUND_TRIP_TIME_MS = AppConstants.DEBUG || AppConstants.ASAN ? 36 : 18;
+const MAX_ROUND_TRIP_TIME_MS = AppConstants.DEBUG || AppConstants.ASAN ? 60 : 30;
 const MAX_RETRIES = 5;
 
 
 const ECHO_BODY = String.raw`
   import struct
   import sys
 
   while True: