When does the 60-day COVID extension start if applied before visa expiration?

The user inquires about the start date for a 60-day COVID extension applied for before their visa expiration on November 21st, specifically whether it starts from the expiration date, the application date, or the stamp date. Comments suggest that the extension duration generally begins on the application date if it's the first COVID extension, but there are uncertainties regarding approval and the potential for varied experiences at immigration offices.