I’ve noticed that most anime have 20-minute episodes, so I’ve decided to start finding shows that go higher than that. Obviously, a lot of shows have double-feature episodes (such as RIN: Daughters of Mnemosyne), but here’s the top 5 I’ve been able to find.
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Made in Abyss: “The Challengers”, “Gold” [reportedly around 60 minutes each]
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Hellsing: Ultimate: “Hellsing X” [67 minutes]
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Pluto: “Episode #1.1” [71 minutes]
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Oshi no Ko: “Mother and Children” [82 minutes]
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Key: The Metal Idol: “System” [97 minutes]
Please do not recommend episodes that are below an hour in runtime.
At that length, I think I’d call it a movie/film even if it’s part of a TV series’s progression.
If we’re including Japanese anime films in general, In This Corner of the World is supposedly the longest at 168 minutes for the extended version, followed by Final Yamato at 163 minutes, and then The Disappearance of Haruhi Suzumiya at 162 minutes – according to this list on Wikipedia.