The Sinking City 2 how long to beat depends on how much of Arkham you intend to clear. The main story runs under 15 hours per PCGamer's launch review; a side-content-focused run lands in the 20 to 25 hour range; and a 100% completion run is 30 to 40 hours per the Frogwares developer figure carried by Pixel Rant and PCGamer. The four-act structure keeps the campaign lean and most of the playtime bulge sits in Investigation side missions and Holloway Manor for Premium owners.
Sources
[PCGamer - The Sinking City 2 review](https://www.pcgamer.com/games/horror/the-sinking-city-2-review) - `media/interview` - checked `2026-08-18` - Jody Macgregor's main story under-15-hour figure and the four-act structure framing. [Pixel Rant - The Sinking City 2 coverage](https://www.pixelrant.com/) - `media/interview` - checked `2026-08-18` - Frogwares 30 to 40 hour 100% completion figure attribution. [Frogwares YouTube channel](https://www.youtube.com/@Frogwares) - `official/store` - checked `2026-08-18` - Developer source for the 30 to 40 hour 100% completion statement and the four-act structure confirmation. [HowLongToBeat - The Sinking City 2](https://howlongtobeat.com/game/146736) - `wiki/reference` - checked `2026-08-18` - Listing for The Sinking City 2 with community-submitted Main, Main + Extras, and Completionist tiers.