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Beat it comfortably in just under 3h using this guide, cheers.
Pretty much anyone will manage this under in under 4h, it's quite straightforward.
Just as a point of reference when playing, I was at exactly 1h upon starting the Old House section, and exactly 2h upon finishing the boat ride after killing Jack. Even if you're slower, as long as you've got at least an hour left over upon reaching the ship you're pretty much set.