Varies depending on what block you are in.
First year with anatomy, histo, embryo (only 2/3 units), and clin med things are crazy hours wise. Lectures begin around 9-1 (unless you have histo lab in the morning) and an hour for lunch from 12-1 then there is usually another lecture from 1-2 and then anatomy lab from 2-5 or more lectures. This block requires a lot of memorization so most of the time studying is spent outside of normal school hours. I believe anatomy labs were about 2-3 times per week and histo lab was maybe once a week. In November when anatomy is finally finished things get a lot more regular. There are very few labs for the rest of the whole first year besides your normal small group sessions for clinical medicine Thursdays every few weeks. Of course physiology, neuro, and genetics all have their little small group sessions but like I said there aren't that many (neuro probably has the most). Not counting the labs, the schedule is usually about 9/10-4 with an hour for lunch.
Second year, things get vary screwy and nothing is ever regular. It has definitely screwed with my sleep schedule due to our physical diagnosis course which is Tuesdays and Thursdays every week though every other week is usually online assignments rather than being at the hospital or the skills center to learn physical exam techniques. In the beginning of the year, you have Micro (First exam is Immunology) and Evidence Based Medicine except that the EBM exam isn't until later. After that, it was hell with Clin Med, Pharm, Psych, and Pathbio and they thought it would be a good idea to test us on all four subjects in the same week. (It was worse than anatomy practical, anatomy written, and histo even on the same day). So for next year they are making psych along with Micro. (God I loved Micro because it was so laid back and all you had to worry about was a single exam every two weeks and no other classes taking up a lot of the time. The labs are pretty easy and the exams were very straightforward and you knew what to study). Dr. Jackson was right when he said we'd be wishing it we were back in Micro. He was also correct when we were in the middle of hell on earth with Pharm, Psych, Clin Med, and Pathbio he told us it would get better. It certain has. Pathophysiology is a great course that takes up the majority of M2 and is the bread and butter of medicine. I've learned an extremely large amount of stuff and even about normal physiology where there were gaps in my knowledge from last year. Either way, I always stream lectures so time has no bearing and all I know is that we have way too many lectures and I am extremely sick of taking notes and watching lectures. Though streaming lectures is an amazing plus for Wayne.