Describes the cause and action for error messages.
not adding time correctly
Excel not showing time correctly - Super User
excel How to sum total working hours with ...
Adding of time in Excel gives a strange answer
worksheet function - Excel isn't calculating the ...
Adding Up Times in Excel Results in Zero - The Excel Trainer
Add or subtract time - Excel - Office Support - Office 365
How to add & subtract time in Excel to show over 24 hours, 60 minutes ...
How to Use an Excel Formula to Sum Time Values
Sum up hours and minutes in Excel by Chris Menard - YouTube