How to change time range for Outlook calendar?

To change the time range for all calendars in Outlook, please do as follows:

1. Click "File" > "Options" to open the Outlook Options dialog box.

2. In the Outlook Options dialog box, please click "Calendar" in the left bar, and then specify the new time range in both "Start time" and "End time" boxes. See screenshot:

3. Click the "OK" button to save the change.

Now when you show your Outlook calendar in Day/Week/Work Week view, the new time range displays left to the calendar as below screenshot shown. When you show your Outlook calendar in Schedule view, the new time range displays above the calendar.

Define and change working hours / days / week in Outlook