a lot. It depends on what kind of grade you want. If you want A's, be prepared to study everyday 4-5 hours. If you just want to pass you can get away with less, but not a whole lot less. The thing is, you have weekly quizzes that cover multiple subjects and a lot of lectures. So it leads to a lot of studying regardless. Then you have cumulative combined finals (Long obnoxious 6 hour exams).
Also depends on how you study and just how easy it is for you to absorb the info. Some people get A's and barely study, but that is definitely not the norm.
1st year is just riddled with exams, week in and week out. No rest until the end. I have never seen anything like it in my years of education. Enjoy!
I'd say closer to 3 hours a day for me, but every person is different. There is one person in our class who doesn't go to lecture and just studies for everything the night before, and she's still sporting a GPA over 3.9.
Your class caught a huge break in that you do not have combined exams any more. Whereas all of our midterms and finals were 3 to 5 subjects (Our last final was a 6 hour exam covering histology, neuroscience, oral biology, facial development and physiology), you guys will have individual exams for these courses. That's not to say that school will be less work, but it will definitely be easier for you to get better grades.