How many hours do you usually get for casual employment

[BreBeeNeuroNurse]

Hi! I'm a new CNA at 17y/o I didn't really know where to ask this so I figured here is okay, if anyone knows a better thread please direct me to it!

I'm a new CNA and I applied at about 10 LTC facilities and got call backs and interviews from 3 so far, one small-sized facility has really caught my attention and I would really love to work there, it's a 74 bed 3/wing facility with a fully locked and monitored dementia/Alzheimer's unit with speech/physical/occupational therapy on site along with some other great attributes.

The only fallback is they only have a casual position available for me, I accepted the second interview. I just would like to know how many hours on average a week you have received on casual shifts. And how often does the average facility have positions open from people quitting?

Oh and I am going to school for my RN full time right now so I'm unsure of what workload I can handle so I think casual is the way to go although I would rather have full time or at least part time so I can better pay for school. My pain worry is saving for a car because my parents don't want me using their vehicles forever.