"longest ever", although it "depends on how you play".
In a new developer diary, Naughty Dog discusses how they approached programming the behaviours of the Infected - "they're not zombies!" The real 'evil villain' is the fungus, not the people.
The reason these aren't zombies? The Infected aren't decaying corpses shuffling the streets but living things coming after you.
"Of course it always depends on how you play the game but the campaign is our longest ever we believe," Monacelli. A demo of The Last of Us is included on the God of War: Ascension Blu-ray but may not be playable straight away, although they will be first. "The first owners to get the demo will be those who buy God of War Ascension!"
The Last of Us releases on PS3 June 14th, having been delayed from May 7th.