The upcoming standalone Uncharted game Uncharted: The Lost Legacy will feature at least 10 hours of gameplay. That can be deduced from statements made by Naughty Dog director of communications Arne Mayer.
According to Mayer, the development studio behind the Uncharted franchise was planning on releasing The Lost Legacy as an Uncharted 4: A Thief's End expansion pack but it quickly grew to become a fully fledged standalone experience.
In an interview with the website IBTimes Mayer further states that when the development team was planning the story of the game they could only come up with a story that would take at least 10 hours to complete.
In Uncharted: The Lost Legacy Chloe Frazer and Nadine Ross are expected to be the main characters. The two are reluctant partners who don't see eye-to-eye, but who must work together to obtain the priceless Tusk from a mysterious warlord named Asav.
Uncharted: The Lost Legacy is expected to release in the last quarter of 2017 exclusively for PlayStation 4.