Appointment scheduling be set to occur at specific intervals during an hour. The setting value is in minutes and should be a factor of 60. Valid values are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60. The default value is 15, which means that appointment scheduling is allowed on the hour and at 15, 30 and 45 minutes past the hour.

The AppointmentInterval key defines the appointment scheduling interval. For example, if you want the interval to be set for every 30 minutes, you would specify the following: