My daughter has an 8am appointment at BBB in Magic Kingdom in May. We're staying at CBR. When I booked her appointment, the person said to arrive 15 minutes early, and allow 1.5 hours of travel time using WDW transportation. Do I really need to leave CBR at 6:15am to get to BBB in MK and arrive 15 minutes before our 8am appointment? How early do the buses start running? Since we'll be headed to MK before the park opens, is there a specific bus/bus top I'll need to use at CBR to get to MK?