1997 Ford Taurus axel assembly

i had AAmco look at my CV joints and boots and was told they me the boots needed cing and the joints need greasing but i live in the dry hot arizona deserat so i think with that many miles i would be better to change out toe axel assemblyies can get them both new for $120.00 and have a friend install them for $45.00 an hour but i need you to telle how many hours it is supposed to take i am sorry about the donaTION BUT I AM ON SOCIAL SECURITY AND DONT GET MY CHECK FOR ANOTHER 4 DAYS THANK YOU