Starting part time job

Hello today I got a job that I am starting on Monday it is part time. I will be working 3-5 days a week but I am on a 10hour contract so i could only be working 2-4 hours a day or I could get 20+ hours on a diffrent week. What way will that work with x's and o's because Im told you have to be working only 3 days or less? Thanks!