Yes they do, I was a seasonal CM at one point. I don't remember the exact hour amount, but you had to work X amount of hours every year to still be in good standing. For reference, I was a part time CM while in college and got a a summer internship at another company for three months. I was able to switch to seasonal, not work all summer, and come back in the fall with no penalty in the same position. But like the other poster said, definitely check the website. This was a while ago so things could have changed.