Usually only an hour straight. It strains my eyes too much so I take a break for about 20 mins for evey hour of use.
Haha my friends always complain I am on too long, but it is normally complete max of 2 hours, but looking at the people year they spend 2/3's of their life on the computer, I guess they spend the rest spealing and eating
I'm online about 8 hours at work, then like most 2-3 hours at night! How sad is that when you think about it
Weekdays about 3 hours. Weekends about 5 hours. I can't stay on the computer for more than 30min strait at a time though.
12 hours straight and sometimes even more. Usually the reason is because I got nothing else better to do offline.