Nah, the next worlds shouldn't take that long.20 Chapters per World means this manga will take 2000 chapters to complete. I'm getting berserk/one piece ptsd right now. I guess I will come back in 15 years guys.
Since the 1st world was a base world, plus in the later worlds MC managed to do a far better job, so the chances of them having a bad end (like the 1st world) is quite low.
And technically, 1st world plot took 15 chapters to clear (chapter 7-21). Chapter 1-6 could just be considered as the prologue.
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