One of these days I'm going to save this reply as a file I can just paste in a reply box to questions like yours. Many people have the same question and often express concern, but I feel there is no need to worry - and here is why:
AKL Jambo and Kidani share a bus together, but they do not share with any other resorts on property. That means when you board a bus at AKL you are on your way to your destination, no stops required. Certainly, being furthest out from MK, the ride will be a little longer from here than from, to use your example, the Contemporary. But it won't be longer than from other resorts which require a bus ride.
Other resorts share buses between them. That means, for example, if you leave WL on a bus to EP, you're going to stop at GF on the way to drop off/pick up passengers. Sometimes buses will even be shared between three resorts. It's my own personal theory that Disney has this down to a science (don't they, with everything else?). My theory is that they have worked out that for guest satisfaction, ride time cannot exceed approximately 20 minutes. So if you're coming from AKL, your ride is about 20 minutes - so no stops and no shares. But if you're coming from WL, your ride could be as short as 5-10 minutes, so guest tolerance would allow for the bus to be shared with another resort without surpassing that 20 minute mark. This allows them to use fewer buses and drivers but still meet guest experience expectations.
Basically, from what I have learned over the years, most bus rides will be in total about 15-20 minutes no matter where you're coming from/going to. The difference will be in whether or not your bus is shared or not shared.
Make sense?
Again this is just my own personal theory that I've worked out over the years. I could be totally wrong. LOL
Let me also say that except for one bus ride over three trips, we have not had ANY issues with inbound buses and have only waited for return buses at peak times such as after fireworks shows or at park closures, when all resorts would experience that same surge. AKL is such an oasis, such an escape from the fun and excitement you spend your day immersed in and for us it is the only place to stay whenever it is financially feasible for us. You're going to love it!