I said 3-5 per day, but I am checking in online roughly every 15-30 minutes while I'm awake. The reason for this is I am at a computer, or have direct and easy access to one (literally within feet of me) 24-7.
Reall It really depends on the day but usually 2-3 hrs. The just depends of your meaning on line. I am alwalys doing down loadong some beta software to test and also always have trilian going so if you count that it would be 24 hrs.