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I wouldn't call SM64 long (at least not by speedrunning standards, although it certainly is longer than any reasonable FFR/Stepmania file). I guess it doesn't really matter though, because 12 hours of gameplay is 12 hours of gameplay - a relatively short game or category just means you can do more attempts in a day. Of course, SM64 definitely demands a very high level of skill, precision, and consistency - it's surely one of the more technical speedrun games.