I always read on my bus commute to and from school, so that's around two hours already. Then, throughout the day, I read whenever I get a chance between classes, and that can be anywhere from another hour to four hours, depending on the day (and if I have homework to do). I tend to spend most of my time at home on the computer, so I don't get much reading in the evenings, maybe another hour or two.
So around four hours a day minimum. I don't think that's too much!