If yiou call a place to ask for hourly charge...you also need to know which "book "they use... having run a dealership, where we used Volvos factory guide our "hours" sometimes were different than an indepenfdent shop that uses 'other manual'....my advice is , dont ask for hourly charge OR no of hours...ask for a PRICE....which is the hours times that guide... the guy with the lesser hourly charge may still cost you more if his guide tells him to use more hours...
if a guide says 2.5 hrs to do the job you charge those 2.5 hrs...doesnt matter if it took 1/2 hour longer...what if it took 1/2 hour less? it does averaghe out for shops , and "good mechanics" will make money , bad mechanics wont until they learn the jobs.