Which long-running anime has the worst filler?

Recap episodes, beach detours, whole arcs invented while the manga caught up: every long-running anime pads, and some pad for years. Which one made you sit through the most?

1

Naruto

The original 220-episode run padded roughly two in every five episodes with side stories.

2

One Piece

Over a thousand episodes and still the leanest of the Big Three, but the filler arcs it does have drag.

3

Bleach

The Bount and Zanpakuto Rebellion arcs pushed the original series close to half filler.

4

Dragon Ball Z

Whole episodes of powering up, screaming and flying toward a fight that starts next week.

5

Fairy Tail

Beach episodes, tournament detours and anime-only arcs stacked between canon chapters.

6

Boruto: Naruto Next Generations

Ran so far ahead of its manga that most of its early seasons are original material.

7

Black Clover

Padded arcs and recap-heavy stretches slowed a series fans wanted to sprint.

8

Inuyasha

Dozens of monster-of-the-week detours between the plot beats of Takahashi's manga.

9

Yu-Gi-Oh! Duel Monsters

Duels stretched across episodes, plus entire anime-original tournaments.

10

Sailor Moon

The 1990s run repeated its transformation-and-villain formula for whole seasons at a time.

11

Case Closed (Detective Conan)

More than a thousand episodes, the bulk of them anime-original cases.

12

Pokémon

A weekly format that can go a full season without advancing anything.

13

Hunter x Hunter (1999)

The older adaptation wandered off-manga before its OVAs pulled it back.

14

Gintama

Filler by design — and often better than the canon it interrupts.

15

Fullmetal Alchemist (2003)

Overtook the manga and invented its own second half and ending.

16

Soul Eater

Ran out of source material and wrote an anime-only conclusion.