You can count on MK and AK to close early except on weekends, I think at 6 PM. MGM closed at 8 PM and Epcot at 9 PM in September. We worked around it by doing MK in the morning and early afternoon 2 days while going to MGM around 4 PM. You can do most of AK in one day if you arrive early and stay until closing. Lines are usually short. We used the shows to rest up after lunch. We didn't catch all of the shows, there is always next year with DVC! We were traveling with a 4 yr & 2 yr. which means a slower pace. With a 5 day pass you should be able to do everything you want if you are not married to 1 park a day.
Sandy