Last one I did on the rotisserie was about as clean as a car as most people would start with. I did pretty much the complete tear down. It needed previous crash damage fixed and had minor rust. Interior I just pulled and put back in as it was, didn't reinstall the drivetrain. Did the rear suspension, brake lines etc... more just a body/paint and partial reassemble. I had over 400 hours into it, but the underside was painted also. I didn't do all the small parts and detail work. To do a full resto from start to finish, easily 1000 hours even on a clean car to do it all. I normally don't keep track, if I do they start to seem like work and I consider it a hobby