Mine is set to 1440, when I get “logged out” I just see a white screen, I’ll do some checks today but I’m not setting my own cookies only sessions to verify loggged_in in my app and those shouldn’t expire until browser closed.
How it works currently (using the PHP script).
User clicks login button - PHP script does its thing - you login at discourse - if that is successful - set the sessions.
Maybe there is a better way to do it, I’m not sure.