I'd use a cooking thermometer... presumably any temperature less than that of melted parafin shouldn't be a problem/danger.
Wax hardens fast because the body absorbs the heat and lowers the temperature of the liquid wax back to that of a solid.
Chocolate might not cool to a solid against your skin because of its lower melting point, which is why I suggested a roll in the snow to cool you down.
Did I mention clean-up is going to be a lot more fun?