How long will it take to replace brakes and rotors in my car?

I have a 1995 Jeep Grand Cherokee and my friend and I will be putting in new brakes and rotors. He knows what he's doing and has done it before. How long do you think it will take?How long will it take to replace brakes and rotors in my car?one good afternoon with the proper tools and assuming everything comes off and goes on easily.How long will it take to replace brakes and rotors in my car?All 4 or just front? Someone trained and with proper toold under an hour for all 4. If he has just done it once or twice, and you dont know how then probably 2-3 hours.