Take what I say with a grain of salt because the exact days may vary for you as they frequently change the schedule up until the semester begins. For summer you have class June until mid-August and then you have the last 2 weeks off. During the summer, gross anatomy is 3 days a week. We were in lecture from 9 AM to 10 AM and then lab 10 AM to 1 PM. We had a 1 hour break and then had palpation from 2 PM until 4 PM twice a week.
Foundations course is one day a week for 3 hours with a lunch break. It seems like you have a lot of free time in the summer, and you do, but most of the time you will (or should be) studying or practicing palpation - including weekends. However, you can still manage to have time for other things outside of school if you study a little bit every day. You learn a lot of material within the 2 months and a half - the material is not conceptually challenging but takes dedicated study time. Your study habits will be put to test - be open to adapting.
For fall you take 7 courses, where you can partially test out of one. You will be in class most days from 10 AM to 4 PM or 10 AM to 5 PM. Kinesiology is conceptually challenging if you have never been exposed to biomechanics and the like. The rest of the classes are a lot of written work and assignments. This semester really tests your time management as you have a lot less free time than summer, but if you manage your time properly by getting assignments done in advanced, and pay close attention in lecture you might not have to spend that much time studying. Really depends on the person. Many assignments and exams end up being due consecutively in one week - I can't emphasize time management enough. Do things in advanced as much as possible - do not wait until the week things are due to start it or until the exam week to start studying.
To summarize because I know this is a lot, it is challenging like you would expect of a graduate program, but manageable as long as you enter with the mindset that this will become your full time job.