I think it's about 3-4 hours.
It's recommended to do when you are replacing the timing belt.
Answering "How do you replace the water pump on a 1994 Toyota Camry?"
Replacing the water pump for that vehicle is 16.0 labour hours. Engine and transmission need to be removed.
draing radiator water from toyota camry1994
how do you install a water pump on a 1992 toyota camry
It has a belt. The recommendation is to inspect the belt at 60,000 mile intervals, but the inspection process is roughly the same labor as a replacement. Most people just replace at 60,000 mile intervals. Also consider replacing the water pump while you're in there.
You can find it in the water outlet.
It is located on the bottom of the radiator
Possibly the thermostat is broken. Easy fix but if not that then it may be the water pump which is a bigger problem only because labor is difficult.
You do not need to, but it's highly recommended. If water pump fails after you change the belt, you will have to do the same work as before to replace the pump.
Check around for prices. I had to replace my entire cooling system last year, and it was $1,900 including labor. My point - you shouldn't have to pay that much, but it can be hundreds of dollars.
I would gees $ 60- $150