Tbh, I think that is exactly what we are getting with this arc.
- Way too many unrevealed Kaido fighters STILL
- The war itself was teased more than 20 chapters ago when Act 2 ended.
- Act 3 may not even begin the real battles, we still don't know.
- Way too many characters in general that need to have their place in the story finished.
We forget that this not Marineford, where 99% of the characters did not have their story end right then and there. Most fights were done in the background to Luffy's perspective. THIS time:
- All 10 strawhats are present
- Samurai, Mink and the Scabbards are present
- Supernova are present
- 2 Yonko are present.
- Neko should bring some former WB/Roger crew members
If the Yonko don't go down, their crews at least need to. Compare to Whitebeard: Only he and Ace were done post-Marineford. Nobody else had their story finish there. And THAT arc was 30 chapter.
TLDR: I also expect 60+ chapters for this War.