It took me a little over 8 hours. And I didn't make any mistakes that cost me any time really. I didn't have to re-do anything and I didn't spend much time puzzling over how things went back together. I may have been a little too meticulous, but really, can you be?
I'm happy with the results, and a bit daunted by the upper playfield which is much more complex than the lower playfield.
Before. Some parts already stripped.
After. Clean and bright. About 95% assembled.