I see how it can take that long. Those shops are providing "best of show" quality paint finishes. That requires cure and shrink time between steps. And the time spent blocking and priming could be hundreds of hours. It could take 2 weeks from the time they start to apply color another 2 weeks cut and buff after a 2 week cure time.
But oh my, the paint finish is so fine one can only take it to car shows in a trailer. And the money ----------