Though it is not long I reccomend maybe the best shounen-ai manga I ever read MW. I don't usually aim to read shounen-ai just I saw the Godfather of anime/manga there and thought it was going to be awesome and it delivered. Also almost forgot RG Veda

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I thought Silver Diamond was good and it's pretty long (it takes a chapter or two to really start going).

if you could make a list public i could help you better but i totally understand you ^^ ... how about this manga then ??

Devil Devil it's a good and enjoyable shounen manga but the cover is worse than the art and it's long
07-Ghost
1/2 Ouji if you havn't read it you should try it it's REALLY funny
Loveless is also good
Silver Diamond
Koori no Mamono no Monogatari

Nana is brilliant and long. Too bad it's on hiatus again.

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what about Nodame Cantabile ts very long and very funny!

ah thank you for all of the reccommendations.i would have been more specific, but it's just i like so many different kinds of manga so i am happy to get any kind of good rec. sorry about not having public lists to make it easier i am fairly new to the forums and am very lazy. hopefully i will get around to my lists sooner or later -_-'

Here are really good long mangas:

Kodocha
Hana Yori Dango
Mars
Nana
Itazura na Kiss
Gintama I guarantee you that you will laugh at this one.
Rurouni Kenshin
Glass no Kamen

Well, I guess that's all I can think of right now....

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I read so much mangas, I'm too lazy to watch anime!

Manga I'm loving ATM: Heart no Kuni no Alice