Actually a while ago I had same thoughts, so I called Front Desk and asked if there a possibility to make it less then 3 hours. They gave me a choise of 2 times but I did not risk it. In my experience, some people still have their bags and it takes time to secure them under bus. Bus makes more then 1 stop, and there is a traffic from time to time. Security line can be long as well. So basically, there are too many factors that contribute to your time and 3 hours is not that much after all.

