Longest string quartets?

A combination of managing a leading UK string quartet AND a strong anal streak which causes me to collect obsessively useless (and sometimes useFUL) information is what is behind this question. I think it is widely accepted that Morton Feldman's 'String Quartet' (actually his second work in the... show more A combination of managing a leading UK string quartet AND a strong anal streak which causes me to collect obsessively useless (and sometimes useFUL) information is what is behind this question.

I think it is widely accepted that Morton Feldman's 'String Quartet' (actually his second work in the medium) is the longest quartet ever written at around 5 hours for a complete performance. The second-longest string quartet I know is the early one in D major (often referred to as No 3, B 18 [no Op No]) by Dvořák, which clocks-in at over an hour and 10 minutes (72-74 minutes in performance, usually). This is a little more than Josef Haydn's String Quartet 'The Seven Last Words' Op 51 which is also nearly an hour and 10 minutes in performance.

Does anyone know of any other works which can join these giants of the string quartet world?

Come on - feed my obsession!

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Update: joshuacharles: I presume you mean the Schubert D minor (Death and the Maiden) which isn't his longest quartet. The longest one was his final one in G major D 887, which is around 45 minutes in duration. adagio58: I'm afraid I must restrict 'candidates' to works originally written for string quartet, as much as I... show more joshuacharles: I presume you mean the Schubert D minor (Death and the Maiden) which isn't his longest quartet. The longest one was his final one in G major D 887, which is around 45 minutes in duration.

adagio58: I'm afraid I must restrict 'candidates' to works originally written for string quartet, as much as I admire Sitkovetsky's transcription of the Goldberg Variations (which I first heard in his string trio arrangement). Thanks for responding, though.
Update 2: Alberich: As far as I am aware, the longest symphony is Havergal Brian's First Symphony (the 'Gothic Symphony') which lasts around 110 minutes (some 20 minutes longer than Mahler 3, probably the second-longest).
Concertos: I expect it is the Piano Concerto by Busoni - some 70 minutes long.
Update 3: ryan: I should have guessed Sorabji would have a place in this discussion. Thanks for the link to the sorabji-files site. I tried to listen to the 3rd Symphony but had to give up after about an hour. I'm not convinced it holds together, but will be listening to more of it. Mark Sarango: Although I was aware of... show more ryan: I should have guessed Sorabji would have a place in this discussion. Thanks for the link to the sorabji-files site. I tried to listen to the 3rd Symphony but had to give up after about an hour. I'm not convinced it holds together, but will be listening to more of it.

Mark Sarango: Although I was aware of John Cage's ORGAN2 / ASLSP, I was NOT aware of 'Longplayer', even though it's happening on my doorstep (relatively speaking, anyway). I nearly drifted-off into a trance when listening to it!
Update 4: Thanks to all contributors - especially ryan and Mark Sarango, from whom I learnt something. So it seems the league table of longest string quartets looks like this 1. Feldman - String Quartet II (5 hours!) 2. Dvořák - No 3 in D major, B 18 (73') 3. Haydn - Op 51 (Seven Last Words)(70') 4. Robert Simpson - No 9... show more Thanks to all contributors - especially ryan and Mark Sarango, from whom I learnt something. So it seems the league table of longest string quartets looks like this
1. Feldman - String Quartet II (5 hours!)
2. Dvořák - No 3 in D major, B 18 (73')
3. Haydn - Op 51 (Seven Last Words)(70')
4. Robert Simpson - No 9 (58')
5. Beethoven - B-flat Op 130 (original version with Grosse Fuge)(48')
6=. Franck - D major (45')
6=. Schubert - G major D 887 (45')
8. Beethoven - B-flat Op 130 (with revised finale)(42')
9. Schubert - D minor D 810 (Death and the Maiden)(40')
10=. Beethoven - 'Razumovsky' No 1 in F major
10=. Beethoven - 'Razumovsky' No 1 in E minor (39' each)
Update 5: Thanks to all contributors - especially ryan and Mark Sarango, from whom I learnt something. So it seems the league table of longest string quartets looks like this 1. Feldman - String Quartet II (5 hours!) 2. Dvořák - No 3 in D major, B 18 (73') 3. Haydn - Op 51 (Seven Last Words)(70') 4. Robert Simpson - No 9... show more Thanks to all contributors - especially ryan and Mark Sarango, from whom I learnt something. So it seems the league table of longest string quartets looks like this
1. Feldman - String Quartet II (5 hours!)
2. Dvořák - No 3 in D major, B 18 (73')
3. Haydn - Op 51 (Seven Last Words)(70')
4. Robert Simpson - No 9 (58')
5. Beethoven - B-flat Op 130 (original version with Grosse Fuge)(48')
6=. Franck - D major (45')
6=. Schubert - G major D 887 (45')
8. Beethoven - B-flat Op 130 (with revised finale)(42')
9. Schubert - D minor D 810 (Death and the Maiden)(40')
10=. Beethoven - 'Razumovsky' No 1 in F major
10=. Beethoven - 'Razumovsky' No 2 in E minor (39' each)
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