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Yes, I believe that experienced players tend to finish the game quickly. But it also depends on their desire and how long they want to play. Inexperienced players will indeed spend a long time wandering through the maze of paths, while an experienced player, if they want to, can finish it quickly. Because the structure of the maps encourages this. And in general, a custom map is, of course, much more interesting than a standard one; there's no arguing that.