2.5 kg of liquid water initially at 18°C is to be heated to 96°C in a teapot equipped with a 1200-W electric heating element inside. The teapot is 0.8 kg and has an average specific heat of 0.6 kJ / kg \cdot{ }^{\circ} C . Taking the specific heat of water to be 4.18 kJ / kg \cdot{ }^{\circ} C and disregarding any heat loss from the teapot, determine how long it will take for the water to be heated.