Everyone should get a main gait pass, but it may be limited to a certain amount of people per day and (x) amount of uses as well. For example my main gate pass is good for 6 days, and each of those days i can get 3 people in at a time. Hope this somewhat answers your question.
Garrett is right. You get 6 days of maingate passes, where you can let in 3 people a day. If you only let in one or two people, they do not roll over, you simply loose that pass.