Joshua4 is right, although I'd count on more than 10 minutes (Joshua4, no disrespect, I just don't want them to miss any kind of appointments at mk like fireworks, parades, etc.).
One neat thing that I like to watch (I'm a nerd, I know) is once you cross the street and the MK/Space Mtn. is on your right, there is a guard house on the other side of a chain link fence with a roadway. To stop unauthorized cars from entering the employee area, the road(looks like steel plates) actually lifts in the air to form a barrier. It has yellow and black stripes on it so you can't miss it. Anyway I thought it was a neat idea and have only seen things like that in the movies. If you are on the Monorail heading to CR you can see it from the "air" as well.