35 minutes. That's a helluva long time. But I'd wager if there was any game you'd happily sit and watch someone else play for over half an hour, it'd be The Witcher 3.
In saying that — people watch other people play video games on YouTube and Twitch every goddamn day. Shows how much I know.
Anyway... this is The Witcher 3: Wild Hunt; a developer led gameplay demo that is epic in length. If you have any interest in this game — and even if you don't — this is well worth watching.