all you need to do is:

remove a wheel
undo the caliper
remove the rotor
replace the rotor
slip in new pads into the caliper
lock down the caliper
put back on the wheel

with the right tools, it can't be more than 30 minutes a wheel.



but like i said, there is a book on how long this should take ... most shops go off of "the book" when giving quotes. @ $65 an hour, expect to pay about $100 to $130 like stated above. *pending if they round up on the half or full hours*