Longest development period for a videogame

Officially announced on 28 April 1997 by developer 3D Realms, the FPS Duke Nukem Forever took another 14 years 43 days before it finally released on 10 June 2011. According to Venturebeat, the game's production was "plagued with delays due to changes in the game engine and other issues". 3D Realms eventually closed in 2009, leaving Borderlands developer Gearbox Software to be tasked with finishing the game by publisher Take-Two Interactive who acquired the title's rights.