AJAX timeout

Configuration > Spider > Rendering > JavaScript > AJAX Timeout

This is how long, in seconds, the SEO Spider should allow JavaScript to execute before considering a page loaded. This timer starts after the Chromium browser has loaded the web page and any referenced resources, such as JS, CSS and Images.

In reality, Google is more flexible than the 5 second mark mentioned above, they adapt based upon how long a page takes to load content, considering network activity and things like caching play a part. However, Google obviously won’t wait forever, so content that you want to be crawled and indexed, needs to be available quickly, or it simply won’t be seen.

The 5 second rule is a reasonable rule of thumb for users, and Googlebot.