It corresponds to how long before the starting time of the Class or a Course a member can cancel the booking. For example, by setting the value to 4, for a Course whose first class begins on January 10th at 8:00 pm, a member who has enrolled in the Course can cancel the booking before 4:00 pm on January 10th. At 4:01 pm you will not be able to cancel it. This mechanism is necessary to protect the owner of the fitness center, avoding members from canceling bookings at the last minute, preventing therefore other members to book the free place.
