Quite honestly, it depends on the day. Over the summer, we had anatomy and physiology, which was T-W-R, from 8-12 (2 separate classes), and we also had lab for that. The anesthesia classes varied. Some days were 8 - 5:30, with some breaks. Other days there was only one class, for 2 hours. Also, your lab group determines whether you will have a full day and have it on the day with only one class. Im sure it will be a little different for your class as well.