LogFAQs > #906377767

" (Why are all of these 2 minutes long??) "

Many classic rhythm games were originally arcade games. The 1:30-2:30 length was probably chosen because it was deemed the ideal length for a song to be to allow people to have fun while also keeping the queue moving / generating money at the arcade. That and some of the rhythm games are pretty demanding, especially things like DDR, so they're often a bit shorter than mainstream songs so that people don't tire out. It might also be tradition and expectation in the genre at this point, I dunno.
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