You'll have to be more specific than that. There are surely countless lost works from ancient BCE times, most of which we have no record of today. As for longest, the 8-hour cut of Greed comes to mind, but I'm sure there are TV series where, if you totalled up the runtime of every lost episode, it would be longer than that.
Post by Terry the Cat on Dec 22, 2017 20:15:35 GMT
Depends on how you define "media" and "lost". If you count oral literature as media, there are thousands of folktales that have been lost to history because those cultures never developed a writing system.
As for longest lost media, 8 Hour Greed is probably the longest single piece of lost media. Other than that, I'd probably say Pinwheel. There are over 200 hours of that show lost.
The missing portions of Beowulf instantly come to mind in terms of lost ancient media that has documentation (even though it's considered partially lost). In terms of longest lost media, probably the thousands of ancient tales that have been forever lost to time due to the lack of preservation at the time, the stories themselves not being very popular and due to their cultures not developing a writing system that can help preserve their works for the next generation. That is why a few of them have proper documentation at all.
In terms of modern media, I would say the 8 hour cut of the 1924 film Greed would be the longest lost media ever made.