I have owned the bike below, a 1946 Raleigh Lenton Sport, since 2013. I bought it, photographed it, took it apart, and that was it until recently. I did invest in new decals from Gus Salmon a few years ago, but it continued to languish. For now, I am going to rebuild it with plans to refinish next year. It is going to be a grocery getter for a bit, so patina is preferred. So nine years from purchase to "back on the road". What's your "longest back burner project"?

1946-47 Raleigh Lenton Sports by L Travers, on Flickr