Ovens have a timer on them which we set according to our recipe requirements. Few ovens have an hour plus timer whereas few have 60 minutes long timer. Nevertheless, all ovens are equipped with a “STAY ON” option so that the oven keeps baking and does not stop until you make it stop.
Do you want a dedicated timer when baking for more than 1 hour?
Suppose you are baking a recipe which mentions the baking time as 1 hour 10 minutes. You could manually extend the timer after an hour is over. But if you have a dedicated timer, you could directly set it for 1 hour 10 minutes.
Generally an hour long timer is sufficient for all of your baking unless you want dedicated timer settings which I feel are unnecessary and could be done without.