Why did you not do this yourself? You described what needed to be done and this job requires nothing more than an allen set and maybe screwdrivers and one or two combination wrenches.

I can't believe the guy would promise a job for saturday, to much retail and piddly repairs going on. Also hard to believe neither you nor the shop knows how to use a phone.

How many people working? Uninterupted, something like that would take, at most two hours, probably just an hour. However, in a lot of shops the guy doing the work also answers the phone, writes up incoming work, runs the cashregister, does all the "while you wait" repairs(flats) fits helmets, sells bikes, unloads the freight truck of the sixty bikes that just came in. So if everything goes wrong it can take many hours to do a simple job. That is why we tell customers that pick up is the day after the work is scheduled and WE WILL CALL THEM WHEN IT IS DONE. Saves problems everywhere.