Configure the standard work week for the calendar to set the work and nonwork days and hours for a standard work week.
To modify the standard work week:
Click the Administer menu and select Enterprise Data.
In the Enterprise Data pane, expand Global and click Global Calendars.
On the Global Calendars page:
Click on the calendar you want to modify.
Click the Standard Work Week tab.
On the Standard Work Week tab, right-click on a working or nonworking timeslot and use the menu options to adjust the workday. You can also resize the working time to increase or decrease the work hours.