When customer programs clock for 60 seconds, it starts counting down 59 58 57 56 55 . When that happens, it quits heating and shuts down.

When customer programs MW say for 60 seconds, it starts counting down 59 58 57 56 55 . When that happens, it quits heating and shuts off. He will cancel, and after a few seconds of heating and counting down, it stops heating and the count down just stays there.