15-25 hours on average
20 hours a week
They expect open availability only to work 20 hours in 5days. So basically, your working 4 hours a day.
Minimum 20 hours a week
Minimum 3 days a week availability
Any PT associates hours will differ depending on what their availability allows and most companies will schedule only what you allow. If you're a student you could possibly work between 15-25 hours a week.
On the average part-time would work 32 hours a week