As we all know the NW is the 2nd half of the GL. And the GL consisted of 14 arcs.
So I believe the NW will consist of the same amount. And this is how it'l play out
P.S. I didn't count FI and return to Sabdy because they didn't occur in the NW.
01. Whiskey Peak
02. Little Garden
03. Drum-Island
04. Arabasta
05. Jaya
06. Skypiea
07. Long-Ring-Long-Run-Island
08. Water7
09. Enies Lobby
10. Thriller-Bark
11. Sabaody Archipelago
12. Amazon Lily
13. Impel Down
14. Marineford
02. Little Garden
03. Drum-Island
04. Arabasta
05. Jaya
06. Skypiea
07. Long-Ring-Long-Run-Island
08. Water7
09. Enies Lobby
10. Thriller-Bark
11. Sabaody Archipelago
12. Amazon Lily
13. Impel Down
14. Marineford
01. Punk hazard
02. Dressrosa - 70 - 100 chapters
03. Zou - shortest arc 30< chapters
04. Wano - 40- chapters
05. Kaidou - (?) chapters
06. Elbaf - 30-50 chapters
07. Big mom - 60(?) chapters
08. Vegapunk - 60-80 chapters
10. Rev. Army (Rragon/Robin's time) / Reverie - >60 chapters
09. Reverie / Rev. Army (Dragon/Robin's time) - >60 chapters
11. Shanks - 70< chapters
12. Raftel (longest arc IMO) - >120 chapters
13. "Promised War" 100
14. Peace. (???)
02. Dressrosa - 70 - 100 chapters
03. Zou - shortest arc 30< chapters
04. Wano - 40- chapters
05. Kaidou - (?) chapters
06. Elbaf - 30-50 chapters
07. Big mom - 60(?) chapters
08. Vegapunk - 60-80 chapters
10. Rev. Army (Rragon/Robin's time) / Reverie - >60 chapters
09. Reverie / Rev. Army (Dragon/Robin's time) - >60 chapters
11. Shanks - 70< chapters
12. Raftel (longest arc IMO) - >120 chapters
13. "Promised War" 100
14. Peace. (???)
P.S. I didn't count FI and return to Sabdy because they didn't occur in the NW.