Longest gap between listenings?

I have no idea what my longest gap is ...but I have been meaning to buy that double Greenslade disc for sometime now. I have the vinyl but can't seem to play them on the way to work in my car,

For me it might be Brain Salad Surgery, by ELP, I just heard it last week, and made me realized how long it had been since the last time I gave it a spin; over 25 years. Another could be The Yes Album, though I heard some of the songs, it's been quite a while since I heard the whole record.

I haven't decided; it's either 23 seconds or 155,235 years.

RIO/Avant Cow - UZ - Art Zoyd etc

Listened to these bands for a couple of years and enjoyed them but never really returned to the genre...someday maybe.

That was 15 years ago.

Normally, I can go a couple years or so between listening to certain albums. However, there are some albums from the 80s that I had on cassette but not CD and I haven't heard them since I got rid of my cassettes about 20 years ago. 

^ You bought Islands and other KC when you were ten....? Now that's what I call precocious.

Genesis were my favourite band for a few months in 1981. I stopped listening to them quite abruptly as I discovered other music (prog and otherwise). I was completely bored with them and had absolutely no desire to play their albums.

With other music I got into at about the same time, such as Mike Oldfield and Yes, my interest waned but not in such an extreme way and I did come back to them again over the years, sometimes with quite a lot of enthusiasm.

With Genesis, I can say with absolute certainty that the only album I ever tried to listen to since 1981 was the Lamb Lies Down on Broadway. I remember it because it was on one of the occasions I got my turntable out of storage. Incidentally, I thought it had some good tracks but fizzled out quite badly towards the end.

This year, I went to see Steve Hackett to keep a friend company and really enjoyed it, and as a result of that I bought Wind and Wuthering on CD. I had never properly owned this but I used to have it on a cassette that I had taped from a friend's vinyl. When I played the CD, I remembered it very well and was able to sing along to most of it. So what's that? 36 years. There might be others where the gap is slightly longer but that is one I can be certain about.

Threads like this get me to dig into my collection again, thanks! I will sit down in front of them and look for some overlooked or long lost treasures and give them a spin. Or rarely find something that is not filed in the right spot. Some disks deservedly do not get played and I should probably get rid of them. But from a big prog group, I would have to go with Genesis Live. The only thing I remember about it is PG's crack about Rutherford's unaccompanied bass pedal solo. Probably been 30 years since I last heard it, and I am not sure why. Maybe I'll give it a go.

I hadn't heard King Crimson's "Islands" much since I bought the LP (I never cared for it much), and they performed "Islands" at their Chicago show, 28 June 2017.