At MY shop or YOURS? 
I take all of my cars to metal. Part chemical stripper - sandblasting where needed. I think we have a bit of a different approach to SANDING down cars. I don't sand them down. 
Two days to take a complete car - any size - down to cold hard steel. You can keep the sandpaper.
Todd
Oxford MotorSports
New York Customs
Maybe you don't sand them down,but your do-boys
So when you get a customer with late model car that wants a colorchange ,you'll strip the whole car to metal? Or a simple fender bender, you strip the whole car if there is light bodywork or do you just drill out spot welds and replace panels because of a scratch? Or how about a car you did that needs touch up work,especially if it's a complicated paint job with graphics,candy,pearl,flake,e.t.c. do you strip it all down to metal or send them down the road because they do not want to strip the car to metal? Wonder who or what insurance co. would be stupid enough to do that or pay a shop to strip a car down to metal for no reason. What makes you think your metal prep work is superior to latest OEM anti-corrosion process? Do you have access to multimillion dollar sterile facility that offers metal washing, dipping and application of primers and topcoats ?
BTW, I work on anything from vintage cars to muscle cars to late model cars,trucks SUV's,bikes,airplanes and anything in between, some of these job do not require stripping to bare metal,especially when some of them come in for touch up and spot repair and keep original paint & value
You may step off the hockey puck pedestal before you fall and God forbid break something
