I remember long songs becoming popular around that time, and I loved and still love Going Home. However I just did a web search and here's what I found.
Pink Floyd Interstellar Overdrive (EP version) 16:46 1966
This is from this web site:
[
www.dprp.net]
Amazing what you can find on the web ....
Marv Peck
Y'all remember that rubber legged boy