It changes based on the classes. Usually first year we had maybe 1 a day, but that included anatomy lab and OMM lab. The vast majority of lectures (I'm gonna say like 90%) aren't mandatory. The only classes that are are OMM lecture and lab, which is usually one of each a week. Then anatomy lab (not lecture), and a few assorted labs like clinical medicine, etc. I live right by school and I still am barely ever on campus. You have a lot of flexibility its nice.
Overall, daily schedule kinda looks like this:
there's usually 4 lectures between 8-noon. Most of the time none of these are mandatory. Then there's an hour lunch break, then usually anatomy lab in the afternoon once or twice a week, OMM lab once a week, and then your miscellaneous labs fit in there too. The exact days kind of switch around but anatomy is most of the time Tuesday or Thursday with the occasional other day. Hit me with any other questions.