Use the General page of user preferences to define or change the time interval that you can view and select when creating or changing an appointment.

For example, if you select 30 minute intervals, when you create or edit an appointment, your appointment time choices are listed in 30 minute increments, such as 8:00 am, 8:30 am, 9:00 am, and 9:30 am. The following minute options are available: 5, 10, 15, 30, 60.

Note: This setting does not affect the way that your calendar listings appear when you click the Calendar tab.

To change the time interval

Select an option from the Time interval drop-down list. The default is 30 minutes. General Page, Calendar Time Interval Setting