Changing a water pump on a 1995 Pontiac Sunfire...How long would it take for a highly experienced mechanic?

It%26#039;s a 4 cylinder, coupe, automatic...|||if everyting goes right and it depends on the type of 4 cylinder you have the quad 4 takes about 4 hours|||Anywhere between 1.0 to 3.0 hrs depending on the condition of the adjacent parts, and how many other cars are ahead of you and the ordering of the new parts.