You could put this in your main form (make sure the form can't be closed)
Set the Timer Interval to 1000

Private Sub Form_Timer()

    If Time() = #7:00:00 PM# Then
        ' code goes here
    End If
    
End Sub

Thanks Kevin.  That will work.  I'm wondering if there is a way to get that code to run without being dependent on an open form?  There may be times with the user will want to close the Main Menu and exit Access during the day.  I suppose I could create another really small form that could be left open on the desktop but that feels like "cheating". :)

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Thanks

This is s timely question as I have the same issue and have just completed the Developer course dealing with the timer.
I mentioned in the course feedback that I would like to see something along these lines.
So thank you to Richard for asking and Kevin for answering.

Thanks Allan.  I wound up creating a very small form that I located inconspuously (via Move/Size) that opens when my application opens and remains open as long as the application is running. Rather than just closing all open forms and leaving the Main Menu open, I decided to simply exit the application with the OnTimer event >= 7:00 pm.  Working well and solves the problem with my "forgetful" user.  If you'd like more details on my solution, just let me know.