Definitely not hot enough for 12 hours. Maybe 2-4 hours. It stays warm for 8-10 hours but definitely not hot or even warm. I'll look into this because my job doesn't have a microwave and the bowl and spoon lid is very convenient. I prefer warm than cold. But it lasts a lot longer than the 10 ounce thermos branded containers. (And yes, I put boiling water in it 10 minutes before eating).
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