Hi Joe,
Welcome to our Community.
After our tests and research, we have not found any rules that can auto-decline meeting invites based on working time. However, since your post is under Outlook category, may I assume that you are using Outlook client? If yes, you can try a workaround by creating unreal events during your off-duty time so auto-decline can come into play within this period:
- Creating a nonexistent event during your off-duty time in your Outlook calendar, and set it recurring:
Open the Outlook client > switch to calendar page by clicking the Calendar icon at the left bottom corner > Home > New Meeting > click Make Recurring and set the recurrence pattern, OK > complete creating meeting, click Send.
- Open the Automatic decline option in Outlook.
File > Options > Calendar > Automatic accept or decline > select Automatically decline meeting requests that conflict with an existing appointment or meeting (NOTE: you need to select Automatically accept meeting requests and remove canceled meetings at the same time) > OK.
Hope the above information is useful to you. If you still have some related questions, please feel free to let us know here, and we will be glad to help you.
Best Regards,
Ariel