A 34-cm-diametere potter's wheel with a mass of 20 kg is spinning at 180rpm. Using her hands, a potter forms a pot, centred on the wheel, with a 14 cm diameter. her hands apply a net friction force of 1.3 N to the edge of the pot. If the power foes out so that the wheel's motor no longer provides any torque, how long will it take for the wheel to come to a stop in her hands?