that's a tough question to answer because i don't think there are any games with 30 hours of play to them unless you choose for it to take that long
most roleplaying games, for example, have quest arcs that last x hours (15, 20, whatever), but that number can be stretched out by several times through all the submissions (to 50+)- if you choose to do them... i'm sure i've spent well over 100 hours with single player diablo 2
every gta game ever made probably lasts around 15-20 hours campaign wise, but you could spend over a hundred hours playing before finishing the campaign, then another hundred hours playing after finishing the story
same with turn based games like civ, a typical game might last around 10-12 hours... but that number can be stretched far beyond 30 hours
and then there are tycoon games, or stuff like total war...
when it comes to straight up linear singleplayer campaigns, the closest i can think of to a 30 hour game is resident evil 4, it took me about 25 hours to play through... i don't know of any linear singleplayer games that run on that long, without somekind of sandboxyness to them - maybe boiling point? i never did finish that.... but again, a lot of submissions, a lot of sandbox to it...
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