Part-time jobs that fit around childcare after 18 years as a quality inspector

I am looking for part-time work that fits around school hours and found a few evening shifts near Providence. 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?

I got the job by going in around mid-morning and asking for the manager. Worth a try.