How many hours to change the water pump while they are changing the timming belt on 2001 Lexus ES300

I am having the timming belt changed and they recommend to change the water pump at the same time. How many hours would it take to replace the water pump so I know what the fair price for the water pump and its' labor should cost.


Asked by for the 2001 Lexus ES300
normally u add another hr plus coolant,this is normal practice