Hmmm...odd...I'll check into it.Just had an incident last night where neither of these applied. I opened two threads in two tabs, quickly left a reply in one thread, went to the other, replied, and I was logged out. All in the space of less than five minutes, so something else is going on.After 30 minutes you will no longer show as online...after about 60 minutes you will automatically get booted, unless you check the 'stay logged in' box.