How much time do you spend on your computers?

I have dual monitors at work because I'm pretty much on my computer all day there. Even when I'm seeing students (I work at a college), I have to look up their info in our system. When I come home or am bored on the weekend, I sometimes like to play games or do some surfing of the web and look through facebook. I'm probably on it 10 hours a day during the week and 2-3 on the weekends!