I can't give you a hard figure cause I just finished doing the job myself. However, it took me about 10 hrs and 3 days to change them. This is with the transmission, axles, cross members, etc... removed from the car. I paid $300 for the hoses from Dali.
I would consider myself a very seasoned do it your selfer. These hoses tested my patience to a level not seen in a while. They are so snug fitting, that I swore they were the wrong hoses for the car. There were several times I wish I could have driven the car to Barnman's shop and paid him any amount to finish the job. However, with no tranny in the car I was stuck doing the job myself
I can't imagine someone doing the job for less than $1,000 including the hoses. I am very interested to hear what others have paid for the job myself.