How many hrs. To change motor

Depends on which 'motor' you mean... Now the 'engine' is another story .. Big difference! .. "An automobile generally has one engine but several motors. Examples of motors in a car include the starter, wiper motor, fuel pump and heater fan motor. The engine burns fuel, typically gasoline, to propel the vehicle forward. As the engine turns, it also powers the generator that charges the battery, which provides the power required for the various motors in the vehicle. However, the engine remains the prime mover of the vehicle as it drives"...