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Impossible to say without knowing three things: the kind of container it's in, the ambient air temperature, and the starting temperature of the water. A cup of boiling water in a sealed thermos that someone put in an oven heated to 100 degrees will take far longer to cool to 78 degrees F (in fact, it never will cool to 78 degrees; it can't get any colder than the ambient air temp, which is 100 degrees) than a cup of 80-degree water in an aluminum canteen cup you stuck in the freezer.

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11y ago

What else can I help you with?