A metal sphere 4 cm in diameter is initially at 30ºC. It is placed in a hot water bath at 150ºC. The heat transfer coefficient between the bath and the sphere is 100W/m2-K, the heat capacity is 0.385 kJ/kg-K, and the density is 8800 kg/m3. Assuming that the internal thermal resistance is negligible, how long will it take for the sphere to reach 145ºC?