how does it measure how long you have been logged in?

[cointrepreneur]

Out of curiosity, how does it measure how long a user has been logged in?  I think it was an option to never log out.  Does it look for clicks on the site, posts that were made, or something else as the 'keep alive' event?

[phillipsjk]

I stay logged out half the time and have racked up 1 day, 7 hours and 26 minutes. I don't think the 8 hour timer is unreasonable if you make few, but researched posts.