A typical day depends on the particular unit that we're in. The curriculum is integrated into an organ-based system. Right now, we're in the musculoskeletal, head, and neck unit so there is a LOT of anatomy. Recently, we've had days where there is lecture from 8-9, and then anatomy from 9-12 or earlier if you're fast.
On the other hand, in the cardiovascular, respiratory, renal unit, there were fewer anatomy labs. Lecture was always two hours, and sometimes three. Throughout all the units, on average you will have lecture for two hours (8-10) and 2 or 3 labs a week (anatomy and histo) from 10-12.
The other component of each unit is PBL. The amount of work you do really depends on your group and the preceptor. For each session of PBL (twice a week), you're assigned a topic to research. Basically PBL (at least at NU) is used to fill in and integrate clinically relevant material in our morning lectures. You have to look up the science too, but most of it is covered in lecture or is in the syllabis. You'll find that you're generally looking for information from journal articles or reviews (and of course, randomy via google =) ) Each person presents what they researched for a few minutes, although some people are very... thorough
The nice thing is that the preceptors will help to fill in if certain topics aren't covered adequately and will let you know what information is necessary for the exams. A LOT of what we look up is not at all tested on exams and is simply there for enrichment (a good thing I think) PBL can either be in the morning after lecture (when there are no labs) or in the afternoon.
So that the main part of the curriculum (lecture, lab, pbl, all related to the particular unit we're studying). The other aspect is called PPS (patient, physician, society) and covers communications skills, physical exam skills, medical ethics, etc. It's usually two afternoons a week for a couple of hours. Pretty self explanatory. Everything is P/F.
Altogether, there is a good deal of free time (at least compared to what I've heard at other schools). Even with PPS, afternoons are usually pretty relaxed and a lot of people try to get most of their studying done then. Otherwise, there are always things going on in the afternoons that you can be a part of (clinics, small research projects, etc.) I would also add that the administration is very helpful and supportive here. Each week, there are always activities that have been arranged for medical students such as the clinical departments giving talks on their particular specialty, doctors openly looking for students who wish to shadow them, etc.