I was able to do this by going to View > Change View > Choose Preview (It was set to Calendar)
It then reverted back to my working hours display as opposed to a 24 hour display (which is not ideal)
As you know, Microsoft Outlook shows the whole day from 12:00 AM to 11:59PM in the Day view of Calendar, although we have assigned working hours. The non-working hours take up too much space and puzzle users to locate exact working hours in a minute. In this article, I will introduce a trick to hide non-working hours in Calendars in Microsoft Outlook.
As the non-working hours cannot actually be hidden from Calendar, this method will guide you to create a daily recurring appointment, and cover non-working areas with color. You can do as following:
Step 1: Shift to the Calendar view, and open the specified calendar in which you will hide non-working hours.
Step 2: Show the calendar in the Day view with clicking the Change View > Calendar and the Day button separately on the View tab.
Note: In Outlook 2007, you can click the View > Current View > Day/Week/Month, and then click the Day button above the calendar.
Step 3: Create a new appointment with:
Step 4: In the new coming Appointment window, specify subject and location, and then click the Recurrence button on the Appointment tab.
Step 5: Now in the Appointment Recurrence dialog box,
(1) In the Start box, enter the time you end up your work every day, for example the 6:00 PM;
(2) In the End box, enter the time you begin your work every day, such as 9:00AM;
(3) Check the Daily in the Recurrence pattern section;
(4) Check the No end date in the Range of recurrence section;
(5) Click the OK button.
Step 6: Now you get back to the Appointment window, and click the Show As box on the Appointment tab, and select the Out of Office from the drop down list. See screen shot below:
Step 7: Compose this new appointment, and click the Save & Close button.
Then you will see all non-working hours are covered by color in the Day view of Calendar from the second day of recurring range.