So assuming each fight is 2 chapters (let's say 1019 is still their fight):
- 1017/1018/1019: Transition, Jinbe vs WsW
- 1020/1021/1022: Transition, other scenes, Brook/Robin vs Black Maria
- 1023/1024/1025: Transion, other scenes, Franky vs Sasaki
That could take care of those 3. Now IF P1/Ulti get back up and wreck the headliners, maybe Usopp and Nami get 1/2 dedicated chapters each as well. Bringing the F6 fights to last around 1030-1032.
During this we'd potentially get some Yamato vs Kaido, maybe a flashback chapter, Zoro recovering and initiating his fight, Luffy returning, the island landing, and potentially whatever occurs with Chopper. Plus every other character not a strawhat. So there's a lot going on here.
Then you'd have the 3 calamity fights. Anywhere from 2-5 chapters imo, depending on how intense Oda wants to make each. I'm not sure who's actually fighting Jack at the end of the day, but if Oda can propel Yamato back down it could be her. That could bring the chapter count to around 1040-1045.
Then the rest is Luffy vs Kaido, 10-15 chapters as per usual with other big plot moments to end the arc. Basically around 1060-1070 the arc should be wrapping up imo. We got a ways to go still. Scabbards, Orochi, Numbers, Big Mom, her crew, way too many additional factors to count, but hopefully Oda delivers those Vs Fights and delivers them without rushing. If Oda delivers a full BM fight or fights for her crew, then this is potentially even longer.
- 1017/1018/1019: Transition, Jinbe vs WsW
- 1020/1021/1022: Transition, other scenes, Brook/Robin vs Black Maria
- 1023/1024/1025: Transion, other scenes, Franky vs Sasaki
That could take care of those 3. Now IF P1/Ulti get back up and wreck the headliners, maybe Usopp and Nami get 1/2 dedicated chapters each as well. Bringing the F6 fights to last around 1030-1032.
During this we'd potentially get some Yamato vs Kaido, maybe a flashback chapter, Zoro recovering and initiating his fight, Luffy returning, the island landing, and potentially whatever occurs with Chopper. Plus every other character not a strawhat. So there's a lot going on here.
Then you'd have the 3 calamity fights. Anywhere from 2-5 chapters imo, depending on how intense Oda wants to make each. I'm not sure who's actually fighting Jack at the end of the day, but if Oda can propel Yamato back down it could be her. That could bring the chapter count to around 1040-1045.
Then the rest is Luffy vs Kaido, 10-15 chapters as per usual with other big plot moments to end the arc. Basically around 1060-1070 the arc should be wrapping up imo. We got a ways to go still. Scabbards, Orochi, Numbers, Big Mom, her crew, way too many additional factors to count, but hopefully Oda delivers those Vs Fights and delivers them without rushing. If Oda delivers a full BM fight or fights for her crew, then this is potentially even longer.