For trips less than 8 hours, you need to cancel or shorten the booking at least 3 hours before the start time, or within 30 minutes of creating the trip. For trips 8 hours or longer, you need to cancel or shorten the booking at least 24 hours before the start time. For a reservation of less than 8 hours canceled, if you cancel or shorten it less than 3 hours before it is scheduled to begin, you will be obligated to pay for the entire amount of the original reservation.