For a conventional, gas-fired hot water heater, with a constant water flow rate of 10.3 L/min entering at room temperature (21 deg. C), we want to determine how long the exit flow rate will remain above body temperature (37 deg. C) if the gas is suddenly stopped. The water heater contains 122 kg of water at an initial temperature of 59.6 deg. C, where you can assume a constant heat capacity of water (4.186 J/g/C). Enter your answer with units of time in minutes (for example: "7.9 min").