Single movement works for string quartet (or string trio)?

[Haffner]

In my very humble opinion the greatest SQ ever: Beethoven's "Hymn of Gratitude in Lydian Mode", third movement of op.132.


This String Quartet can actually improve the listener 0:).

[snyprrr]

Greatest single movement...of aaawwwlll time...

Lekeu Molto Adagio

also,
Lekeu Meditation
Webern Langsamer Satz, SQ, Rondo
Roslavetz 1+3
and hey...I got one no one else...ALL of Malipiero's 8!!!

I'm still having trouble finding single movement SQs between Schoenberg No.1 (1905; 50min) and Stravinsky Double Canon (1959;1.5min). Please help me out here. Many of the pieces mentioned so far (Wolf,Puccini,Lekeu) seem to be of the miniature string orch. genre, I mean, most of these pieces ARE known in their larger guise. True single movement SQs begin with Schoenberg's 50min monster, yet I struggle to find many followers before the 50s. Isn't one of Langgaard's 6 SQs in a single mvmt?

Evangelisti Aleatorio (1959)4min
Pousseur Ode (1960)20min
Wyschnegradsky Composition in 1/4tones (1960)6min
Berio Sincronie (1964)17min
Scelsi No.4 (1964)9min
Mayuzumi Prelude (1960)
Takemitsu Landscape (1961)
Wolff Summer4min
Brown (1965)11min

It seems redundent for me to note that at least HALF of SQs since the 60s are single movement works, and the closer we get to 2009, the higher the percentage seems to get.

Can't think of the first 20th cent. trio, though.