In another forum we searched for the longest Metal-Tracks out there and then came to the topic-Named band. Corectly they call themself NǽnøĉÿbbŒrğ VbëřřĦōlökäävsŦ and call their music-style "Ambient Cosmic Extreme Funeral Drone Doom Metal".
Their longest track is more than 6 hours long (bringing the Album including it to a playtime of nearly a day).
You can get all of their music for free from their website: http://nanocyborg.net/index2.php
Right now I've listened for the.. "music" for about 1 hour where I completed one of their newer tracks. If you want to count that to music, then you can decide wether it's simply boring or the most frightning shit you might probably have heard so far.
As for me I count myself to the second statement about their music.
I'm a man who can build up a phantasy of what he's (me) hearing. So while I listen to the sounds i find myself sitting in completely dark room. The sounds of the "music" are all I hear and all I see is... uhm.. a little light coming through the window where the blinds don't shut close enough.
After about 20 minutes my heart was beating like shit, i had panic attacks and Silent Hill could be a nice town to make my holidays in. To be honest, the only reason I write this is to have a little light right now and to interrupt the accoustic trap I found myself in for the last 15 minutes..