Handy tool, but I can tell you, it takes longer than that. Sometimes you may end up waiting 30-45 minutes for a bus, which I have done at POR, then add on the travel time, 20 min to MK. More realistic, I would add at least 20 minutes to that 17 minute travel time. Also, be aware, especially in the morning going to a park and leaving the park to return to the resorts, you may end up waiting for another bus as it could first bus gets filled before your up. It does happen often. Just plan plenty of time and it'll make things alot easier!