Originally Posted by uzumakinagato
You still have Hajime no ippo, a manga that will take way longer then One Piece. Talk about a slow manga, won't be surprised if that reaches 1500 or even more chapters.
I mentioned ToTT because it's already finished. If I were to mention ongoing manga, Kochikame has 35 years and almost 1800 chapters and it'll probably have 3000 chapters before One Piece even catches up with the current numbers.