22 hours. There is no evidence, it was first invented by Anthony Beevor in his anticommunist book about fall of Berlin in 2002.
It just backfired here because while Churchiloid libs on reddit shake with concern over the smol bean SS-men, we think it would be based, although i would certainly don't want to torture my ears by 22 hour long piano marathon, which also together with the fact nobody had this much time on their hands during one of the most busy battles in history of mankind point on the story being fabrication.
