97 minutes

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.