I would like to propose using new feature which is Working Calendars: https://docs.espocrm.com/user-guide/...time-calendar/
You have there formulas https://docs.espocrm.com/user-guide/...mula-functions
And you can use them to determine whether user is available today or not

Thanks to this, if you have Advanced Pack (which i recommend!), you can create workflow which will send email if user is not in work today

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