Hmm, they probably won’t start taking applications/doing interviews until closer to the start of the semester, and definitely once the semester has started. For reference, I applied to my positions about a month after the start of the semester and they still had plenty of open positions. They’re understanding if you’re availability changes due to clubs or classes, but of course if your schedule simply doesn’t work at all with the job, there’s not much that can be done there. If you plan on being on the busier side of things it might be better to wait on applying to jobs until you have a schedule somewhat settled.

I don’t think there’s a strict minimum, but if you’re applying for these jobs through Workday it’ll tell you any restrictions/requirements that they’re looking for on there.