Long single-player games this generation (40+ hours)

[Jdevil3]

Yakuza 3 (PS3)

Yakuza 4 (PS3, released only in Japan, releases in March this year in the rest of the world)

Ryu Ga Gotoku: Kenzan (PS3, released only in Japan)

Nier (PS3-Xbox 360)

Resonance of Fate (PS3-Xbox 360)

White Knight Chronicles (PS3)

Star Ocean: The Last Hope International (PS3)

Star Ocean: The Last Hope (Xbox 360)

Demon's Souls (PS3)

 

I don't know, there are a lot of games xD