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Many animes have filler episodes and arcs. So this question has two parts:

  1. Which anime has the most number of filler episodes? 
  2. What is the length of the longest filler arc?


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Which anime has the most number of filler episodes and the longest filler arc?


Percentage wise [bleach](/questions/tagged/bleach "show questions tagged
'bleach'") has the most fillers, since it has a total of:

  * 366 episodes

  * 160 filler episodes

which means **43.4%** of the anime are fillers.

[naruto](/questions/tagged/naruto "show questions tagged 'naruto'") and
[naruto-shippuuden](/questions/tagged/naruto-shippuuden "show questions tagged
'naruto-shippuuden'") combined have

  * 640 episodes
  * 238 filler (1st season 89, 2nd season 149)

which means **37.2%** of the anime are fillers.

[one-piece](/questions/tagged/one-piece "show questions tagged 'one-piece'")
has

  * 682 episodes
  * 97 filler episodes

which means only 14.2% of the anime are fillers.

But if you were to look at the sheer number of filler episodes,
[naruto](/questions/tagged/naruto "show questions tagged 'naruto'") has more
fillers with 214 filler episodes.

And I believe the longest filler arc would be in [rurouni-
kenshin](/questions/tagged/rurouni-kenshin "show questions tagged 'rurouni-
kenshin'") where the last 35 episodes were fillers.

Source: Own experience, Google, [Filler Guide
(webarchive)](https://web.archive.org/web/20170606145453/http://www.fillerguide.com/filler-
lists)

**EDIT**

> "why in your estimation, none of the longer-running series beat out Bleach
> and Naruto under the definition of "filler" that others already provided
> above" \- seijitsu

Taking a few of your given long running samples such as [sazae-
san](/questions/tagged/sazae-san "show questions tagged 'sazae-san'") and
[nintama-rantarou](/questions/tagged/nintama-rantarou "show questions tagged
'nintama-rantarou'") makes the question quite simple to answer.

In the case of Nintama Rantarou non to barely non fillers have been aired.
This does not mean it did not have fillers, because they certainly had. They
were extras which as far as I know where only available on dvd. Furthermore
they did not have a plot/story to follow, which makes the only deviation the
moment the story would not be based on the manga, which in almost all episodes
is the case. Also with the episode length given in this series 3 episodes
would be the equivalent of 1 episode in naruto and the likes, which in this
way easily out does this particular one.

In the case of Sazae-san, Sazae-san actually **Did not have ANY filler
episodes**. Long running does not mean it needs fillers, there are several
which never got a filler, even though they had a particularly long run time.
Here follow a few

  * GE 999
  * Hoka Hoka Kazoku
  * gundam First
  * Sazae san
  * Kochi kame
  * Lupin III
  * the Super Robot Saga shows [ Maziger z Getta Robo and Grendizer]
  * Ninja Hitori kun


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Detective Conan (Case Closed) has the highest total filler amount of 313
filler episodes out of 811 episodes. Detective Conan has most fillers spread
out so it doesn't have very long filler arcs.

Naruto (not shippuuden) has the longest filler arc with episodes 136 - 219
being fillers, which makes a total of 83 fillers in a row. This filler arc ran
from 25 May 2005 to 1 February 2007.

Source: [Detective Conan](http://www.animefillerlist.com/shows/detective-
conan) [Naruto](http://www.animefillerlist.com/shows/naruto) [Naruto
Shippuuden](http://www.animefillerlist.com/shows/naruto-shippuden)


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