The timing of the first movement (Molto moderato) must be badly off the mark here. It's one of Schubert's most expansive movements for piano and in any other recording I've seen it clocks in between fifteen and slightly over twenty minutes (depending on whether the repeat of the first five minutes is observed). Pollini himself took almost nineteen minutes in this recording: https://www.discogs.com/Franz-Schubert-Maurizio-Pollini-Die-Sp%C3%A4ten-Klaviersonaten-D-958-959-960-3-Klavierst%C3%BCcke-D-946-Alle/master/482790 and Wilhelm Kempff twenty minutes. I guess there was a typo somewhere when the above entry was added...four minutes would make a ridiculous pianistic feat. ;-)