"It all comes down to how you want to play through the game," lead designer Mike Brinker told Pixelvulture.com.
"Expect to spend around 30-40 hours getting everything done. This is gathering every weapon, ability and completing every side quest. Running through the game will take you around 15 - 20 hours. So expect double the play time collecting everything and exploring every secret tomb."
Rise of the Tomb Raider is said to be three times larger than the previous game, as well as including plenty of tombs to explore.
"In terms of scale, all our hub spaces, the areas that allow you to explore and choose your own way to play, have been increased by three time the size," Brinkler continued. "So there will be lots more to see and do in each area of the game too. We have more challenge tombs, crypts, caves, and a bunch of extra things to do like the side missions for the Remnant people, and the tomb guardians."
Rise of the Tomb Raider arrives on Xbox One and Xbox 360 on November 13. The PS4 and PC versions are due to follow in 2016.