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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There are 6 cups in 48 ounces.
Approximately 3 cups of flour equals 15.5 ounces.
10 fluid ounces equals 1 and 1/4 cups.
Three cups = 24 fluid ounces.
There are 3 cups in 24 fluid ounces.