This website contains age-restricted materials including nudity and explicit depictions of sexual activity.
By entering, you affirm that you are at least 18 years of age or the age of majority in the jurisdiction you are accessing the website from and you consent to viewing sexually explicit content.
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.