If you count names and causes of death as separate puzzles, Return of the Obra Dinn is around 100 puzzles long. The two Portal games are less than 100 puzzles put together. Blue Prince is what? 50ish elaborate, intricate puzzles? (darts and parlour notwithstanding). Chants of Senaar, Opus Magnum, Space Chem are all in that same ballpark too. Puzzle games with a lot of levels, like Patrick's Parabox or Baba Is You, cl…
> At one puzzle a minute, that's 24 hours of gameplay.
Unfortunately we're not all as smart as you but in TFA he estimates it'll take 400-500 hours to complete all of them.