How Many Times Can You Microwave Something. “you can reheat food as many times as you like, but you need to reheat it to 75 degrees celsius and the only way you can work that out is. A microwave oven will heat your food unevenly, leaving cool pockets where bacteria can thrive.

They note that a home microwave may completely kill germs within 60 seconds to 5 minutes. Then you actually check it halfway to give it a good stir because you'll find you've got hot spots. For health care workers, cdc guidance says they can be worn five times.