Arc Break

A lot of comic books function by appearing in compilations first.

Hasty endings notwithstanding, authors with moderate popularity will sometimes put 'breaks' between major arcs not just for downtime, but in case the story ends for whatever reason and they can end them in a somewhat satisfying manner. Sometimes this is an organic part of the storyline, the author fishing for more money, or the author working on another story.

Unless of course, the people funding said storyline would really like them to continue; compare Franchise Zombie. This becomes a big problem because sometimes the author is 'forced' to stretch an idea, making very good marks in the road to running too long because the author is out of ideas and has to start coming up with very different ones. Occasionally an older idea that provided 'closure' is ignored or reversed to allow for this.

Naturally, these stories end up running quite long. Fans sometimes use them in a suggestion of relative decline, even if the story itself remained decent.

Anime and Manga

 * The run of Rurouni Kenshin's manga originally ended serialization in 1999, but later got a 2012-2013 remake and 2014 spinoff, and then a for-real continuation in 2017 with Rurouni Kenshin: The Hokkaido Arc.
 * One Piece's "Post-War" arc ended with a one-month break followed by the "Return to Sabaody" arc right after. There had been a two-year Time Skip in the story where the characters trained until their reunion.
 * Vinland Saga went on a break before Makoto Yukimura wrote the final arc.
 * Dr. Stone's artist, Boichi, and writer, Inagaki, took a one-week break to do research for the final arc.