Ustvolskaya's fourth also clocks in under 7 minutes..
Or Klemperer!Obviously, Celibidache hasn't recorded any of them.
Klemperer’s deceleration or relaxed pacing is largely a characteristic of his later (stereo) years and seems a function of the inevitable slowing of mind and body with advancing age, exacerbated in his case by the cumulative weight of his medical setbacks, which critic Harold Schonberg described as "a Job-like succession of misfortunes [and] blows that would have demolished a weaker person." For example, his Beethoven Seventh grew from a conventional 36 minutes in a 1951 Concertgebouw concert to 37½ in 1955 with the RIAS, and then, with the Philharmonia, to 38½ in his 1955 mono recording, 41½ in a 1960 stereo version, 43 in a 1968 remake and 44½ in a 1970 BBC concert. Klemperer's 1951 Missa Solemnis is remarkably fast paced – its 72 minutes would not be matched until the emergence of historically-informed readings a generation later. His Bruckner Fourth from the same period is perhaps the fastest of record at 51 minutes. Klemperer’s early mono recording of Mahler’s Das Lied comes in under 51 minutes (vs. 64 in his 1964 studio recording).Or Klemperer!
Well, we're going up to 30-35 minutes, then the list would include 1000s of symphonies ...Honneger's symphonies easily fit on one side of an LP ( which is my defn, of a short symphy,)