Long songs.

Atrox - "Panta Rei/Gather In Me No More"
Dreams Of Sanity - "Komöida III - The Meeting"
Fates Warning - "Epitaph"
Hexenhaus - "As Darkness Falls..."
Mekong Delta - "Dances Of Death"
Sacrilege - "Search Eternal"
Shadow Gallery - "The Queen Of The City Of Ice"
Shadow Gallery - "Ghost Ship"
Sieges Even - "Straggler From Atlantis"
Sieges Even - "Tangerine Windows Of Solace"
Skumring - "Søvn"
Skumring - "De glemte tider"
Skumring - "Forførelse i natten"
The Gathering - "Black Light District"
The Third And The Mortal - "Oceana"
Voivod - "Jack Luminous"
 
Dream Theater go on forever.
Agalloch are usually lengthy.
Fates Warning - A Pleasant Shade of Grey is all one song.
Bathory's Hammerheart is full of lengthy songs.
 
Akroma (Sept)
Eldrig (Mysterion)
Graveland (Fire Chariot of Destruction, Will Stronger Than Death)
Hellveto (Stos)
Enid (Seelenspiegel)
Limbonic Art (In Abhorrence Dementia)
In Lingua Sea (Bellowing Sea- Racked By Tempest)
Negura Bunget (N' Crugu Bradalui)
Moonsorrow (any album; these guys have tons of long songs)
Summoning (any album)

Also, almost any funeral doom band would suffice.
 
Wow, received alot more feedback than i expected.
Thanks for all these recommendations, it will take quite some time to listen through all of it.
But hey, that's what i asked for :D
 
fav long songs.

Edge of Sanity `crimson.
Anathema `we, the gods.
Type O Negative `a death in the family,haunted
Pan.Thy.Monium `the battle of geeheeb,thee-pherenth,untitled first track on Dawn of Dreams.
Evoken `lost kingdom of darkness,where ghosts fall silent.
Katatonia `brave,funeral wedding.
My Dying Bride `the return of the beautiful,symphonaire infernus et spera empyrium.
The Gathering `sand & mercury.
 
Pig Destroyer - Natasha 37:56 (album)
Wormphlegm - Tomb of the Ancient King (funeral doom album) (longest song is 30 minutes)
Alot of shit from Reverend Bizarre
alot of stuff also from Godspeed You! Black Emperor
weakling - dead as dreams 20:39
Pelican
Warning - Bridges
Mourning Beloveth - Dust (especially the last song from that album, which I believe is 11 minutes)
Shape of Despair - Angel of Distress (album)
Disillusion - Back to times of splendor and The sleep of restless hours
The Morningside - The wind, the tress, and the shadows of the past (album) * - best rec so far from anyone, without a doubt. so it gets a star
 
Opeth - Morningrise
Swallow the Sun - Plague of Butterflies
Wolves in the Throne Room - Two Hunters
Old Man Gloom - Seminar III: Zozobra
Electric Wizard - Come My Fanatics...

A few I've been enjoying lately...
 
Doesn't really get any better than Dream Theater - Octavarium. (The album is good, but the title track is spectacular)
 
I also think, even though you're specific about metal here, you should also keep in mind some classic prog rock and fusion out there. When I need to take that kind of journey (which is often), I usually go there. It's a shame there aren't more long pieces within metal, but you can still find very musically, instrumentally challenging and atmospheric stuff within progressive and experimental rock-related music.


Even if it's not metal, Voodoo Chile by Jimi Hendrix is really good.
 
Opeth-Black Rose Immortal
Dream Theater-A Change of Seasons
Fates Warning-A Pleasant Shade of Gray
Deep Purple-Son of Alerik
Enslaved-793(The Battle of Lindisfarne)
Iron Maiden-Rime of the Ancient Mariner
 
if soft music like Iron Maiden counts, then I may as well recommend Michael Angelo Batio and Vinnie Moore, since their albums are entirely instrumental.
 
I'll add the following two, assuming they haven't been already:

Cathedral - "The Garden" (27m)
Sleep - "Dopesmoker" (64m)
 
But often without the preferable instrumental breaks the op was looking for. Some songs that do have em...Forest of October has the longest one I think, then In Mist She Was Standing and Deliverance end with like 3 minutes of instrumental, Morningrise is good for that too of course.
 
But often without the preferable instrumental breaks the op was looking for. Some songs that do have em...Forest of October has the longest one I think, then In Mist She Was Standing and Deliverance end with like 3 minutes of instrumental, Morningrise is good for that too of course.

Orchid is extremely underrated, it's such an amazing album. The Forest of October, The Apostle in Triumph, Under the Weeping Moon, are all some of their best songs.