I've played through it three times. The last time it took 15 hours, so I'm guessing that's fairly close to the minimum if you don't skip dialogue, but never get stuck. It's not a difficult game, but there are a few puzzles that you can get stuck on for an hour or two before either solving them or resorting to a walkthrough, so I think the 20-25 hour estimate for a first playthrough is quite accurate.
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