Outlook doesn't support a 20 min scale - you'll need to enter the end time.
You can tab into the end time and type 20m. It'll convert to 20 min after
the selected start time.

--
Diane Poremsky [MVP - Outlook]
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"HelpWithCalendarTimeBlocks"
. com wrote in message
...
how do I set time periods in calendar for 20 minute blocks