Being on the schedule for an 11 hour shift is definitely unusual unless you're agreeing to come early/stay late or you pick up a shift. Technically, you're not really supposed to be scheduled for more than 8 hours plus a meal, but my store has been known to schedule TMs for as many as 10 hours including meals if coverage is tight. 11 is a lot, however.
And you technically have until the Monday before the schedule posts to request days off. However, time off is never a guarantee, and sooner is always better (especially in Q4).