Well I was doing fine, impressed I was still logged on after having gone away for dinner and come back, and then it logged me out as I clicked on Later Posts on this very thread.
Even if you were in Togo, it shouldn't be a problem as long as as the clock is set right for the timezone the computer's in.
I'm putting it down to you doing something odd. Perhaps your magic privacy proxy thing cleared it after a few hours of inactivity. Yes, that's most likely it - your fault ;)
Hopefully. You'll need to be browsing round the site to keep your session active, any page should do it - the session timeout's set to 4 hours (that's 4 hours of total inactivity)
Having been thinking about this into the early hours, I came to the conclusion that you'd only been using the BBs.
With the code we put in place last week, doing this would indeed keep your session open on the appservers, however your cookie would still expire (prompting you to log in again)
We'll be fixing this today - I'll post when that code's live.