Evening and part-time openings around Pittsburgh, hotel front-desk agent here

I am looking for part-time work that fits around school hours and found a few evening shifts near Pittsburgh. I have read a lot of threads here and could not find my exact situation. They can give a schedule two weeks ahead. How many hours do they guarantee?

Thanks for writing this out. I went through something close to it 3 months ago, and it settled down once I kept a simple log of every call and form.