Auto Repair Careers

I'm still confused how you achieve that kind of volume for one person. Also don't understand how you "average about 20-25 hours per day"? I'd be dead in two weeks time at that pace, plus there is only 24 hrs in the day where I'm from, so I'd already be 14 hrs behind in those two weeks alone.

Guess I'll just stick to engineering and design work, it has paid me very well over the years.
Flat rate pay is based on the estimate. Say a bumper pays 5 hours to paint. I get paid 5 hours to paint it. If you're efficient you are generally 200% efficient. That means I turn at minimum 2 hours for every hour I work. 24 years of experience is beneficial. Prep and paint 4 bumpers in the morning you just made 10 hours in 4. Do 4 more in the afternoon and you just made 20 hours in one day.