The temperature at which it will last the universe's current age is 462K. This is 189 Celcius, or 372 Fahrenheit. They didn't choose an unreasonably low tempera

The temperature at which it will last the universe's current age is 462K. This is 189 Celcius, or 372 Fahrenheit. They didn't choose an unreasonably low temperature to say it'll last the universe's age. They picked a temperature to say it'll last the universe's age even if you crank up the heat to an absurd degree. They could have given a much larger timespan if they stuck to room temperature.