Being that Konami is already facing much criticism for continuing the Metal Gear franchise without Hideo Kojima, this latest news will not help “Survive” one bit: not only will an internet connection be required to play the game in single-player mode, but microtransactions appear to be a prominent aspect of the game.
In terms of length, Konami brand manager Jennifer Tsang told GameSpot that you can expect the game to take you 15-20 hours to play through the campaign. Of course, your mileage may vary, as everyone plays games differently. Also, the game has co-op and multiplayer so there are more reasons to come back and play more beyond the campaign.
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Source: [H]ardOCP – Metal Gear Survive Requires a Constant Internet Connection, Has Microtransactions