43 chapters is insane, For reference in Wano the strawhat fights started 998 and all ended in 1049 51 chapters and that was including Yamato, Scabbards and Supernova chapters that were mixed inbetween that period of time
If we lowball extremely here.
5 more chapters for flashback
10 chapters for Imu fight
10 chapters for outside events
5 chapters for the rest of Elbaph (Heaven Realm?)
30 chapters left at the absolute minimum, and only if Oda is going for unusually faster pacing. 43 chapters is completely within reason.