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.