I have watched several 10+ hr Youtube videos in sections, including a 17.5 hr Subnautica playthrough by Shirrako (One of my favorite channels to watch when I have a ton of freetime to spare).
The theoretical longest video on YouTube displays a runtime of 2.1 billion hours (roughly 245,000 to 250,000 years) by the channel ShinyWR, though it uses metadata exploits and is an unplayable, infinite premiere rather than an actual media file
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