One way to establish how good or bleh a longer song can be is to ask yourself "if it was X minutes shorter, would the song suffer or benefit from it?".
Songs with a certain sense of narrative flow, such as Yes's 'Gates Of Delirium' or Frost*'s 'Milliontown', usually fall into the former category for me. After all, if they were shorter than they were, they wouldn't feel as complete from a compositional point of view.
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