Eidos Montreral’s bio-modification-heavy cyberpunk noirish* prequel, Deus Ex: Human Revolution, has over a solid day of gameplay from start to finish. Speaking to PC Gamer, producer David Anfossi references play-testers of the latest complete build who generally work a six day week. He claims:
So far with them playing about six hours every day, most of them don’t complete the game.
Six days playing for six hours is actually 36 hours, so we assume producer Dave is quoting the play-through time of some of the more hardcore of testers as his 25 hour benchmark.
Anfossi also mentions how the game opens up, with casual players invariably getting something extra out of the game the more they get into it. He states:
The ones that are more casual gamers, who are used to more ‘corridor, cut-scene, corridor, cut-scene’ type of gameplay — they play it that way for a while. Then suddenly, there’s this new world that opens to them, and they start getting a bit more creative.
*Say that five times fast.
Source: PC Gamer