Now THIS i can heavily agree with and see. The actual time frame didn't make sense to me, but the actual content of the story does. Especially because we only get 3 volumes a year now basically, not 4-5 as this suggests.
20-30 is also a huge range, that's like 100-110 chapters, and it also wouldn't surprise me if he still is underestimating or really has no idea on how big this remaining storyline will be.
But yeah, if Wano ends by 104/105, I can see there being 20-25 volumes left, but even that has the potential yo be an underestimating.
There is still so much left to do with so many characters. Ganbare Oda.
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I think Oda is trying to end his story exactly at volume 120. Editor Sugita said, "
He told me that the first part of the story, the part prior to the time-skip, was around halfway through. That was about 60 volumes"
http://www.onepiecepodcast.com/2015...nterview-with-one-piece-editor-suguru-sugita/
In fact, Oda exactly finished the timeskip at volume 60. The name of volume 61 was
"Romance Dawn: For the New World"
We are currently at chapter 1011, which should be published in volume 100. That means Oda has 20 more volumes to finish his story. If we assume, 5 of those volumes will be dedicated to rest of the wano, then he will have only 15 more volumes. He will need those 15 volumes for the final arc. I think this is what Oda is aiming for: One more massive arc after Wano. In fact, Oda said in his 1000 chapter message,
"Luffy's adventure is near the final arc"
As much as I'd "like" this, it's pretty unrealistic. Remember that we haven't seen Elbaf yet or know where the 4th RP is. We need to reach Laugh Tale and then pursue the final arc. Its not like Luffy will beat Kaido and go immediately to fighting Blackbeard, a story requires escalation to do so. This is why it's also fundamentally important that the characters know exactly what Roger found out in order to fight the WG.
Wano is the conclusion of a 400 chapter plotline and there are far more important characters beyond Wano. These characters need time to escalate their plots.
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So 200-300 chapters left at best.
5.5 - 6 years to be precise considering Oda take break more often than any other mangaka.
1 month : 3 chapters at best.
1 year : 36 chapters at best.
200 chapters left : 36 chapters per year (at best) = 5.5 years
Again, at best is tough to say because the man does underestimate the length of his arcs. He has pointed this out with DR and WCI, which were meant to be far smaller