Eliahu Inbal
Mahler's instruction is "Sehr langsam" (very slowly). Mahler and Mengelberg played it in about 7 minutes. Some conductors have taken tempos that extend it to nearly 12 minutes (viz. recordings by Eliahu Inbal, Herbert von Karajan, and Claudio Abbado), while Simon Rattle with the Berlin Philharmonic performed it in minutes. The shortest recorded performance is from Mengelberg (Concertgebouw, 1926) at 7′04″. The longest commercial recording is Bernard Haitink (Berliner Philharmoniker, 1988) at 13′55″. A recording of a live performance with Hermann Scherchen conducting the Philadelphia Orchestra from 1964 lasts 15′15″.