L.A. Noire is set in "a perfectly re-created Los Angeles" of 1947, with players being given an open-ended challenge to solve a series of murder mysteries. There have been reports that the game is going to take you around 25-30 hours to complete the main story. Team Bondi has created 8 square miles of LA, so that means the map is huge, isn't it? A look at the four screens below show that the game's map is indeed vast and begging for exploration.  
 
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Source Thanks Godchild1020.