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Use case: Please cook my food for 12 minutes at 600W to be ready to eat at 12:30.

An alternative could be to let the user do the math, and change it to "Please start cooking in 3h27min for 12min at 600W".

Most microwaveable food can't be safely left at room temperature for hours.

Great market opportunity to make a fridge/microwave combo?

I think hot food vending machines do that already.