20 years

I find the parts you don't take off you don't have to put back on.

I also found that if I can't get things back together in a week end or two I'm screwed.

Had a 68 mustang started as an engine rebuild, then an engine compartment cleaning and repaint. 1 year later the entire thing was disassembled in a storage unit. Shell sat on parents driveway for 5 years. Finally sold the parts and scrapped the shell, too bad rust free CA car.