the title isn't grammatically correct and the preview thumbnail is youtube view-grabbing garbage
the video is also about 15 minutes too long
and the premise is stupid as hell, because if you count single-developer indie titles, then there are an infinite number of titles that have been in development longer than duke nukem forever, but whatever let's just pick one of them so we can have the exciting "ACTUALLY DUKE NUKEM FOREVER ISN'T THE LONGEST GAME DEV IDIOT!!!!"
5. too human: 9 years, 8 months (they are counting the period where the game was cancelled and not in development at all)
4. final fantasy 15: 10 years (i am not sure where this number with no months comes from, given that the game was announced june 2006 and released november 2016, but whatever, i guess he decided to switch from years-months to just years)
3. prey 2006: 11 years (they are counting the periods where the game was cancelled and not in development at all)
3 again. diablo 3: wasn't in the original video
2. duke nukem forever
1. unreal world, a no-name PC rpg that released on Steam after like 25 years of on-and-off development
youtube gaming channels are so bad
(note that the maker of the video is being paid $7,000 a year on patreon)