I was just on Allure last week. I don't recall the time for suite guests since we did self debark....but you can get off later if you wanted to just so long as it is after your "zone", ie: if you are zone 5...but you get off with zone 40..that'll be fine. To be real honest, RCCL never says no...so as long as you're off when they need the ship to be empty you'll be fine.
As far as breakfast goes, Windjammer was open super early (545am), Cafe Promenade was open at 6am, Park Cafe was 6am I believe as well.
Hope this helps