diff --git a/addons/web/static/tests/qunit.js b/addons/web/static/tests/qunit.js
index 8451d76ef9d..1677bd76157 100644
--- a/addons/web/static/tests/qunit.js
+++ b/addons/web/static/tests/qunit.js
@@ -309,8 +309,9 @@
     });
 
     QUnit.debug = (name, cb) => {
-        document.body.classList.add("debug");
+        owl.whenReady(() => document.body.classList.add("debug"));
         QUnit.config.debug = true;
+        QUnit.config.testTimeout = 60 * 60 * 1000;
         QUnit.only(name, cb);
     };