According to Naoto Sugiyama, the game's Executive Producer, this is where you will spend about "8 to 10 hours" of gameplay.
8-10 hours seems short.
It probably depends on how you complete the game (e.g., talking to NPCs, quests, etc), but I'm guessing it's the core gameplay that is very short. Still, 8-10 hours seems reasonable for this type of game.
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