In my estimation from last June, it probably takes less than 30 minutes to reach any park. We always tried to arrive at the stop about an hour before we wanted to arrive at the park entrance. The busses run frequently, every 20 minutes or so. This was our first time using the Disney busses and the only time we had an issue was the morning we had ADR's at Chef Mickey's. We just missed boarding the bus to MK and had to wait. We were almost 10 minutes late, but CM's was able to accomodate us with little wait.