It depends on who is doing the job =)
Did they also do belts or anything like that?
Did any of the nuts / wires seize or break?
It is hard to say..
I know I had to chop my alternator lug to pull of the alternator because the nut was stuffed... I had to put the alternator in a vice (nut) and turn the terminal with a shifter to get it off without damaing the connectors inside..
If it was a straight forward removal, I believe there are a few ways of doing it but the radiator should come out for more space so you don't damage it... you can also take it out from under the car (which saves some time) whereas the general practice would probably be to remove from the top so PS pumps etc have to be moved out of the way....
How well do you know these guys? are they honest?