Change the calendar time scale in Outlook
Although the most common calendar intervals are 15 minutes and 30 minutes, you can also change the time scale interval of your calendar to 5, 6, 10, or 60 minutes.
Important: Steps may be different between new and classic Outlook for Windows. To determine which version of Outlook you're using, look for File on the ribbon. If there's no File option, follow the steps under the New Outlook tab. If the File option appears, select the tab for Classic Outlook.
To change the time scale interval of your calendar in new Outlook for Windows:
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In the calendar, select the View tab.
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Select Time scale, and then select the grid interval from the drop-down list.
To change your Time Scale in classic Outlook for Windows:
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In Calendar, select the View tab. Be sure you've selected Day, Work Week or Week view in the Arrangement group.
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Select Time Scale, and then select the grid interval that you want to show in the calendar.