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It depends on your courseload that semester. When I was taking organic chemistry I would spend a good 8 hours in the library a day monday-thursday on top of class, which would open the weekend up for partying. Wake up at 10 for class at 11, then straight to the library with the occasional break for meals or other classes until 11pm or so, whenever I got too tired to continue. By my senior year when I was just taking interesting electives, I was totally coasting, probably throwing in 2 hours a week in the library in total.