Anyone else given this a spin yet?
Boston, 25 March 1949 (Addison, Merriman, unnamed choir, BSO). Wave Hill Radio Archives box set "LB: Historical Recordings", released last year. Also of interest: 26 mins of LB rehearsing the work 4 days before, including about 5 minutes of LB crooning/groaning ("croaning") "Urlicht".
Timings:
1. Allegro maestoso 22:14
2. Andante moderato 10:37
3. In ruhig ... 9:39
4. Urlicht: 5:08
5. Finale: 32:13
Total time: 79:53
N.B. Can be heard on Spotify, also.