Complex SharePoint Calendar Validation Issues

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Occasional Visitor

I am having trouble figuring out how to correctly add date and time validation my calendar. I've tried modifying other formulas I found online but I can't figure this one out. Any help would be appreciated. My requirement is:

"The time slots would be limited: Monday, Wednesday and Friday; the times will be 12:30, 1:15, or 13:30. 15 Minutes per appointment."

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