"Long" is kind of relative in a game like Yume 2kki. There's some routes with lots of worlds you have to pass through, but it doesn't take much time to get through each. Then there are some that only have like two areas you have to pass through, but they're both fucking massive.
Though, now that I think about it, the child effect route takes the cake in both of those categories. Christ almighty, I hope I never lose that effect to a glitch.