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I mean I managed to finish all the side missions/quests and the main story in about 8.5 hours in game time and the game even has a trophy for finishing the story in under 2 hours(which I started a fresh game to try to get a few times already and have failed). For reference the game has a total of 12 chapters.

That being said, it has that chill, play at your own pace vibe that most games I play such as far cry, cod, destiny, etc lack and was a pleasant surprise that has wanted me to keep playing it even after collecting all the items, memories and finishing the story.