Breh, Uncharted 1 on PS3 is about 8~9 hours long and that's a frigging linear A to B game.Guess we'll find out soon enough, and I mean 8 hours going from start to finish. Not with extra side mission and quest or objectives. Because a lot of people only play a game start to finish.
God of war 4 was about 18-20 hours from start to finish. I personally see this game being about 10-13 hours long. But 8 wouldn't really surprise me.
Ratchet and Clank is about 11 hours and that's a linear game.
Sunset Overdrive is over 20 hours long but somehow, Spider-Man, a open world game is going to be shorter than even most linear game?