To give you perspective, I am enrolled in a 3-year pharmacy program that requires a minimum 90% to continue in my courses. I have class from 0800 - 1600 with the occasional opportunity of getting out an hour early once or twice a month. I take bout 2 or 3 hours to take care of family obligations (wife and two kids) and sometimes longer if I have personal appointments or meetings in school since I am in a couple of student leadership positions (nothing extraordinary but it keeps my focus off the books). When all is said and done, a typical day will have me starting my studies around 1800 - 1900 and will continue 'til about midnight or the occasional 1 in the morning depending on the material. I will squeeze in 45 minutes to 1 hour of study prep before classes start as a refresher. I would say for the most part I put in about 6-7 hours of "true" study time Monday through Friday outside of class. Again, this depends on my class appointments and obligations at home.
On the weekends, I once again attend to my family in the morning and evening, so I will put in about 4 hours before stepping away from my studies and then continue for about another 4 hours before taking another true break and put my mind on something else (watch an episode of whatever I want on Netflix or taking my kids out to play around while I get some fresh air. Some weekends will consist of 7 - 10 hours depending on the material (Sundays is around 5-6 hours sometimes less).
Exam week I take it easy two days before the day. I will do a light review for about 3 hours and put the books down. The day before my exams I will once again put in about 3 hours (more if I feel its necessary) and do some activities with family to keep my mind at ease. The weekend after an exam I do nothing. Now that I am starting my IPPE rotations, my study plans will alter as needed (My IPPE rotation consist of 8 hour days in the pharmacy every other week as of now).
In total, I'd say I put in about 47 - 52 hours on most weeks with the occasional 60 hour weeks plus about 27 - 32 weeks during exam week which is about every other week throughout each semester. Keep in mind, I only get about 3-4 weeks off from Dec - Jan and the rest of the year I am in school minus a few days off between certain semesters plus a portion of the summer working in the pharmacy Monday - Friday. It's not your typical 4 year program, but I would say the concept of my studying should put things in perspective for you. I have young classmates that can power study three or four days before an exam and party every other weekend and seem to do ok.... I am not that student so take it for what its worth.