Probably read about 15-20 hours a week in graduate school, much more so around exam time, plus extra time doing assignments, prepping for treatment sessions and doing research.
I really only read a little bit around test time in undergrad. You can get perfectly good grades just paying attention in class and taking a few notes to get A's in many undergraduate classes, besides many of the science classes.
Now that I am out of school, I only read magazines because my attention span for reading is shot!
Lewdog's record in Royals game threads: 18-11.