friend trying to rip me off .......

Guys need a little help...
I thought this guy was my friend he is trying to say that he spent 56 hours to do my front kelsey hayes 4 piston disc brakes. The job was supposed to be completely replace everything, rotors, seals, bearings, calipers, hoses etc. He did not rebuild or redo anything I brought him new rotors and remaned calipers and all the other stuff was new.. He is supposed to be a top shelf mechanic. I will buy 16 hours (2 days), but not 7 days or 56 hrs. This was not a rusty/crusty job either there is not butchering or alterations it is completely stock, it was a straightforward job. Am I overreacting or is he trying to gouge me.......I tried to find old shop manuals that would give the amount of time to to do the job but no luck....I'm guessing that a competent mechanic could easily do the work in a day