Metal Gear Solid 5: Ground Zeroes is short. Painfully short, if a preview in the print edition of US mag Game Informer is to be believed.
The preview's only available in the print mag, but Kotaku
picked up on it. It quotes the mag as saying, "Judged just by the core story mission, Ground Zeroes is short. We completed it in just less than two hours."
Do keep in mind that this only refers to the "core story mission". We don't know what sort of volume side quests and the like might account for.
The game is out on March 21st and, while it's not full-price, it's not cheap either. The PS3 and 360 versions will set you back £29.99, while the Xbox One and PS4 versions are £39.99.