What’s worse than not being able to get a meeting with someone? Getting a meeting request for a time when you’re not working. We can’t stop that, but we can help you set up Outlook so that at least people know your working hours.
When you create a meeting request in Outlook, the Meeting > Scheduling Assistant helps you find a time that you and the meeting request recipients are both free.
When you open the Scheduling Assistant, the hours shown for each day aren’t from midnight to midnight, though; they’re from 8 am to 5 pm.
This is Outlook’s default working day, which you can change to whatever hours you work. Click File > Options > Calendar and look for the “Work Time” section. You can change your working hours here.
As an example, we’ll change our working hours to 10 am to 4 pm and then click “OK.” If we open a new Meeting request and click on the Scheduling Assistant, our working hours have changed to reflect the new hours.
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Source: How-To Geek