I'm flabbergasted to see there are seasoned users that still believe Erbaf is about to end. Guys, seriously, It's the same for every final fight of a big arc in OP.
I understand wanting something, but one has to be logical about it. The final fight alone tends to be 1/3 if not 1/2 of the arc. Onigashima in particular was, but WC and DR/WC too:
- In Dressrosa Luffy vs Doflamingo began in chapter 752--> the arc ended almost at 800;
- in WC Luffy vs Kata started in 878 --> the arc ended in chapter 902.
- I trust I don't have to quote Wano.
20-30 chapters are already conservative. Maybe even 40-50.