You may be familiar with the term comp time. Comp time refers to the practice of allowing an employee to take extra time off from work after a long week, instead of overtime pay. What you may not know, is that in most situations, the practice is illegal, if you are working for a private, non-government employer, and you are a non-exempt employee who is otherwise eligible for overtime pay.
For example, if you work 56 hours in a week and you get two eight-hour days off in some other week to offset the extra 16 hours, this might be illegal. You should get paid overtime for the 16 hours you worked in the first week.