What's funny is that in the joint interview done with Horikoshi and Oda, Oda pretty much tells Hori that you basically just end up doing more than you think.
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ODA: Let us keep fighting together for popularity in Jump from here on in too!
HORIKOSHI: Of course...ah, no....
ODA: How many volumes do you estimate the series will be?
HORIKOSHI: Honestly I thought about 30 or so would be about right, but I hadn't really been counting at all...
ODA: Then shoot for about 50.
HORIKOSHI: Can I really do ten years though...? (Laugh).
ODA: Rather than if you can, it's more like you'll end up doing it.
HORIKOSHI: Then you had already decided on how many volumes One Piece would have from the start?
ODA: Of course. Though it's gone about triple my original calculations.
HORIKOSHI: It it because while you were drawing the series the amount of things you wanted to portray multiplied?
ODA: They multiplied and broadened.
HORIKOSHI: Yeah, even for me the Sports festival arc was about twice longer than I had originally expected.
ODA: That's what happens when lots of characters get together and act at once....it gets really difficult to predict how things will go. But I wish you luck on the battlefield that is Jump.
HORIKOSHI: Ah, yes...
ODA: How about a proper response with resolve?
HORIKOSHI: I'll do my best to to overcome even One Piece!!
ODA: I won't lose, you know.
HORIKOSHI: Ah, I said it. (laughs). Thank you very much.