A:Answer The best I figured out is when you open the door it gives you options, one is for reheating. It asks what you are heating and you hit that number. Then you have the option of 1, 2 or 3 for length, select one of them and you are on your way. I have not figured out the length of time but it will show you when it starts so you can stop and change the length. I also did not receive a manual so it is indeed a go as you learn game.