ASC has a 25-minute pick-up window. This means that the bus can arrive to pick you up anytime from 5-minutes before to 20-minutes after your scheduled pick-up time.
You must be ready to go and be outside or waiting where you can see or hear the bus and be seen by the driver anytime during the pick-up window. Once the bus arrives it will only wait 5-minutes before going on and reporting you as a No Show. Once the bus leaves your pick-up point it may not be able to come back.