It took me around 25 hours to do my BTTF and I didn't tumble anything. It was also my first strip-everything-off-cleaning of a pinball so I had a small learning curve. Most of the time I'll work a machine in sections due to space constraints. So I was being extra careful with labeling and pictures so everything could go back fairly quickly and easily. I also spent almost 2 hours just cleaning the Mylar to raw pf seem as it had a lot of dirt and grime.
I was also cleaning the inside cab, head, and exterior.
Also I was working it 1-2 hours at a time. Typically after 10 pm when I'm nowhere near as efficient.
