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Does the temperature of the region affect the speed with which the hot pack meal heats up?
It can make a difference, but it is the actual temperature of the meal that makes the most difference, for example in a cold climate, if the meal is extremely cold or frozen it will take longer to reheat.. If you have packed it or stored it a higher temperature it will take less time.
In warmer climates, the meal is already warmer and will then not take any longer.
It is best not to store at very high temperatures as this may effect the best before date.