First off, Body shops are not Restoration shops. Two completely different animals. Body shops work for the Insurance company; they get payed for a fender repair; 4 hours. So, the Body shop hustles and does it in 1 hour, they pocket the rest. So, you can get crappy fixes. I see crappy fixes all the time from 70s and 80s body shops; they filled the problem with Bondo. Restoration shops will take 8 hours to fix that fender, but, charge you 4 or 5. THAT's why it takes so long. Personally, I've had a 49 Chevrolet since Jan 2012 that came in for a Media Blast and metal fix. I had to completely disassemble it (part of the agreed upon contract), figure out a method to mount a non-uni body on a Rotisserie, then, evaluating the body I determined we need to find another car, this one was too far gone to even mess with it. 5 months later, I find one on CL, a same year Texas car in far better shape. Owner funded its purchase, I then retrieved it, disassembled it, mounted it in the same Rotisserie the other was in and started going to work. The main factor has been, and will remain the owner's budget, usually no more than $1500.00 a month to fund this project. And, that equals like 20 hrs billable work, and some supplies. The equation is more money = more time spent on the project = faster completion. To sum it up, I'd certainly like to finish this faster, but, I'm primarily a Media Blasting operation with that on the side, owner understands this. Good luck!