Good day,

I have an Excel sheet that I am training some colleagues on, and during the exercise I want to encourage them by showing the UI message when they have completed typing (10 or 20 sentences or more, for example), and this cell in which the number is located is a group equation from another tab in the same sheet.
This is an illustrative picture

I want to show the UI message when they have completed typing (10 or 20 sentences or more)

Thank you.