What is the longest (in duration) ever song to be released as a single?

A band called Porcupine Tree formed by Steven Wilson, released a single called "Voyage 34", which lasts 30 minutes and 4 seconds.

This apparently is the SECOND longest single of all time.
I have been unable to identify the one that is longer.

There is debate about this (do you count live recordings?) But:

Manuel Gottsching - E2-E4 is almost 60 mins (it's divided into track names, but it's all one song)
New Order's "Peter Saville Show Soundtrack" clocks in at 30:13
Spacemen 3 - "Rollercoaster" is over 17:00
And there is an Acid Mothers Temple song that goes for > 60 mins. something Lemonade?

Klaus Schulze- Picasso Geht Spazieren - 154 min.
I must admit that until the list gets to the 40 min. area I had not heard of any of the artists

http://www.expose.org/index.php/articles/display/klaus-schulze-silver-edition.html


[ dprp.net/specials/longsong/list.htmlno longer exists ]

The world's longest song is "Art of Life" by X Japan. This song is 34.8 minutes.

http://wiki.answers.com/Q/What_is_the_world's_longest_song