The actual bus ride from AK to AKL is short - about 10 minutes, but if you are leaving at park closing there will be many others leaving at the same time so you may have to wait longer at the bus stop if there is a long line. Disney recommends allowing 45 minutes when traveling from one destination to another. The good thing with AKL is if you are early there is so much to do - go outside and see the animals and talk with the cast members, look at the African art in the lobby and hallways, and visit the gift shop.
After dinner take the bus to an open park and transfer to your resort bus there or take a taxi. As a last resort, take the bus the DTD and transfer to your resort bus, but that often takes a really long time.