Buffer Time Before and Buffer Time After – These options give you the possibility to set the time before and after the appointment that needs to be reserved so that another booking for the same service and employee would not be made. It will not be seen on the front-end, but it will reduce the number of free time slots in the schedule of the employee. “Buffer Time Before” can be interpreted as the time your employee needs to prepare for appointments, while “Buffer Time After” is the time after the appointment that your employee needs to rest, clean up, or do something else before being able to accept the next appointment. Like for the “Duration” option, the time slots you see here are based on the setting defined in the “Default Time Slot Step” in “General Settings”.