"Long term listening is still the gold standard of audio evaluation. Short term evaluations often lead to errors but it's much harder to hold an inaccurate evaluation over the course of many listening sessions and sometimes it takes many hours to find the faults of the playback system.
That is a myth unfortunately. Your long term memory is quite "lossy" as the brain can't possibly remember everything the hearing system captures. This has been proven through controlled listening tests:
"The results were that the Long Island group [Audiophile/Take Home Group] was unable to identify the distortion in either of their tests. SMWTMS's listeners also failed the "take home" test scoring 11 correct out of 18 which fails to be significant at the 5% confidence level. However, using the A/B/X test, the SMWTMS not only proved audibility of the distortion within 45 minutes, but they went on to correctly identify a lower amount. The A/B/X test was proven to be more sensitive than long-term listening for this task."
See how we behave on ASR? you say something but provide no proof. I say it and not only provide proof, but also fundamentals of how our hearing works.