A student from mech 237 that is very conscious about climate change decides to take a cold bath to avoid greenhouse gas emmissions derived from heating up the water using natural gas Since the student has studied the laws of thermodynamics, he knows that his body, being warmer than the water, will end up heating it and thus, he can enjoy a carbon neutral bath. How long will it take the water to reach body temperature? Express the result in hours with two significant digits. Consider that the bathtub has a volume of 250 l, tap water temperature is 15°C, body temperature is 37°C and his body dissipates heat at a rate of 100W. Consider no heat losses to the environment.