I agree, unless of course the time factor is stated up front. Then you have a choice to leave the guitar or not. My tech does all work by appointment. If it's basic stuff - setups, fret dresses, nuts, electronics - he does it all while you wait, right in front of you, on a makeshift workbench that looks like it's seen decades of service. He has a 2000 sq ft shop in the back, where's he got some nice old cast iron woodworking machinery, buffing station, spray booth, etc. He explained that it can be isolating working alone all the time, and he enjoys the personal interaction. Also, many people drive over an hour to see him, and he'd rather not force them to make two trips. When he took weeks to do the frets on my 335, I knew that in advance. For that job, that guitar, I was much more interested in perfection than speed.