I'm on an average of an hour or two. I love the forum, and I used to be completely addicted to it, but I view other real life things as more important. Plus, I have a lot of family responsibilities I have to uphold. Though, I will admit, if I'm online, which is quite often, PC almost always occupies atleast one tab (multiple tabs open at times). Most of the time, however, I am not on PC, so I don't count it time on the forum.
But today I was on for six hours.