Back in the days of MAX scheduling (at least at my store), you could only be scheduled up to 5 days in a given week. You were allowed to work up to 6 days (either by picking up a shift from the shift swap or being called in) as long as it wouldn't result in you exceeding 40 hours, but when making the schedule, they would only give you up to 5 shifts.
As long as you're ok with it, you won't hit overtime, and you're not working more than 6 straight days, you should be fine.