There's a priority deadline of December 1st, but that's really only applicable to undergrad students since there aren't federal grants for vet students. I typically did my FAFSA in March/April each year and it was fine. I don't recall any specific code for the vet school, just search Kansas State University and it should pop up.
I agree with this, it really varies also depending on how well you utilize your time while studying. I know I would certainly have some days I was "studying" all evening but only maybe an hour or two was actual productive study time. I tried to give myself at least one evening a week I didn't study at all, however second and third year this wasn't always possible since we more often had two tests per week.
As far as amount of time spent in class, you can see the current class schedules here (hopefully these links work):
First and second year were generally 8 or 9 until 4 or 5 most days, with an hour break for lunch. Third year we had afternoons off more often depending on when we had junior surgery lab or clinical skills (not everyone goes every time that's listed on the schedule).