When I'm home and not tired or just bored I can stay on until the wee hours of the morning...although I browse other places and forums on the web as well.
When I come on these forums, I don't have a time where I say, "I have to get off now." I stay on as late as I want, as long as I'm not breaking any rules.
I visit fourums every two or three days usually...but this one I usually come back to once a week 'cause then there's more posts -...and then I just see which ones I'm into replying to.