Longest time? I hate to admit it, but it was almost 10 years. In 1996 I was in a camera shop, and they convinced me that it was a good idea to have the shutter adjusted on my ME-Super. It seemed like a good idea since the camera was getting older, so I gave it to them to work on. $85.00 dollars later I walked out with my adjusted camera. After that I didn't use it for a few months. Then one day I picked it up to take some pictures, and it was not working right. The lever would advance the film, but would only cock the shutter every 4 or 5 frames. I'll tell ya, that is a really fast way to blow through film! The shop that I had work on the camera was not local, so I couldn't just go down and stare them in the eye and tell them to fix it. Naturally I was fried, frustrated, depressed. What a pathetic story!
So 10 years later, my kids are growing up and I need to take pictures! The wifes P&S Nikon is not doing the job. So I pick up my old ME-Super and looked it over and figured I didn't have anything to lose to try and fix it. I fiddled with it for a bit, found the problem and fixed it!
Now I have 10 years of photographic depression to work out, so I'm taking pictures like a mad man.