Flexible shifts hiring in Austin

I am looking for part-time work that fits around school hours and found a few evening shifts near Austin. I have read a lot of threads here and could not find my exact situation. Shifts are four to six hours and the pay is weekly. How many hours do they guarantee?

Keep everything in writing and save the confirmation numbers. It saved me later.

I worked evenings at a hotel. The hours were steady and the team was friendly, but weekends were busy.