Hello, @TFS,
Actually, it is the minimum value, and sometimes it does not work when the server is not fully compatible, so if it is not working for you then please increase it to 600 or 1000 and then try again.
And if the issue will still persists then please share your site WP Admin URL and Credentials and CPanel URL and Credentials in a private content area of this topic and let me know which demo you want to import and with which page builder, so that I’ll import that demo for you on your site.
Regards 8Themes Team.