So I think I know the answer to this but want to confirm and ask further questions.
Whenever you run most microwaves in timer mode, it stops the microwave operation at 0 seconds, but continues to leave the light on, the fan running and even the tray rotating for an extra 2 or 3 seconds. Why do they do this? One manufacturer's site mentions that its to cool down the elements inside.
But if this is the case, does that mean that if you manually stop the process by either hitting clear/stop or just opening the door, are the elements not being cooled down as they should? Because manually stopping the process prevents the cool down cycle from happening. Will manually stopping the microwave shorten the lifetime of the microwave?