Old as in before 2000.

By Long I mean 400+ chapters

preferably completely scanlated.

no preference about genre or demographic.

I read Sangokushi a while back and it was long old gold that I found purely by chance. If you know about any series like that, please reply

Ashita no Joe, Basara and Eyeshield 21 are all what I'd think of as old and long......and yeah, all completely scanlated.

Good luck 🙂

You know, when I saw this I was like "easy" but it turns out most of the series I think of as "long" are more like 200 chapters than 400.

I wasn't sure if you meant completed by 2000 or started in 2000, so I included both.

400+:
Major. Its completed scanlated, although once you get past a certain point the scans are super low quality- I think a group right now is going through slowly and upgrading the poor quality ones.

150+
Please Save My Earth
Glass Mask
Hana kimi
Yu Yu Hakusho
Hana Yori Dango
Nodame Cantabile
Shaman King
Akumetsu
Claymore

Honorable mentions (Oldies/goodies that are completely scanned but are less than 150 chapters. They're all more than 50 though)
Hikaru no Go
Banana Fish
Parasyte
Ashita no Ousama
BioMeat: Nectar
Dance! Subaru

Does the walker choose the path, or the path the walker?

Flame of Recca

3x3 Eyes, 577 chapters.

[img]http://www.dragonflycave.com/wpay/mew.gif[/img]

Jojo no Kimyou na Bouken, maybe, if you consider all the different parts as one. Serialisation started in the 1980s and is still ongoing. Parts 1-7 are completely scanlated; part 8, which is the current arc, is up-to-date. Not exactly what you asked for, perhaps, but thought I'd mention it just in case. 400+ chapter series which haven't long since been abandoned are vanishingly rare, so...

I thought it´s easy too, but it really isn´t 😃

I guess the following maybe too obvious, however i post them 😛

• [Naruto](https://www.mangaupdates.com/series.html?id=15) (from 1999 - 700 Chapters)
• [One Piece](https://www.mangaupdates.com/series.html?id=33) (from 1997 - ongoing with 927 Chapters)
• [Detektiv Conan](https://www.mangaupdates.com/series.html?id=604) (from 1994 - ongoing with 1024 Chapters)
• [InuYasha](https://www.mangaupdates.com/series.html?id=1048) (from 1996 - 559 Chapters)

My suggestion:

• [Karate Shoukoushi Kohinata Minoru](https://www.mangaupdates.com/series.html?id=15194) (from 2000 - ongoing with 475 Chapters)

• [Crows](https://www.mangaupdates.com/series.html?id=3406) (from 1990; itself is Crow short, but the univers is pretty big - just look [TAKAHASHI Hiroshi](https://www.mangaupdates.com/authors.html?id=977)

Not scanlated:

• [Jjang](https://www.mangaupdates.com/series.html?id=2186) (from 1996 - 74 Volumes)

Don´t meet the terms, but still old and pretty long

• [Change Guy](https://www.mangaupdates.com/series.html?id=258) (from 1998 - 338 Chapters)

I think the well known/loved Mangas are long for a reason ... 🙄
I wonder why there isn´t a Categorie for long series 🤨

You should probably check Ryuurouden if you haven't already done so. The manga started in the early 90s, for 37 volumes. And was followed by 2 sequels. It follows the same themes as Sangokushi, which is no coincidence since both are (loosely) based on romance of the 3 kingdoms. If you liked Sangokushi, chances are you'll like this one too.

Big minus: the scanlation for this series dropped a while ago. If you can manage with raws, it might not be a problem though.

Dragon Quest - Dai no Daibouken

From 1989 with 349 chapters, an incredibly straightforward shounen based off of the early Dragon Quest games.
Like the games, it uses every cliche in the book, but it does it in such an earnest way that it's really fun. It starts off kinda okay, but it really gets good as it builds up over time.

rurouni kenshin is one of my favorite....

you could check the Wikipedia of manga by volume count too XD

https://en.wikipedia.org/wiki/List_of_manga_series_by_volume_count

Thanks for all the replies.
I didn't expect this many series to go under my radar all this time I spent searching with Advanced search.
Especially series like Ryuurouden. I'm really surprised I didn't see this when I specifically searched for The 3 kingdoms period.

Also, Even though I said 400+, I'd really appreciate some

(Oldies/goodies that are completely scanned but are less than 150 chapters. They're all more than 50 though) too.