The previous world record holder before BG&E2 was Duke Nukem Forever which took 14 years to develop and 9 years from the initial announcement in 2001 to the release in 2010.
Half life 2 episode 3 is supposedly still in the works and supposed to have been out in 2007. You might argue it was cancelled in 2011 when they announced half-life 3 was in development. Half life 3 has yet to be officially cancelled and leaks came out a few years ago of it being an active project.
The previous world record holder before BG&E2 was Duke Nukem Forever which took 14 years to develop and 9 years from the initial announcement in 2001 to the release in 2010.
Half life 2 episode 3 is supposedly still in the works and supposed to have been out in 2007. You might argue it was cancelled in 2011 when they announced half-life 3 was in development. Half life 3 has yet to be officially cancelled and leaks came out a few years ago of it being an active project.