Oda want to wrap Wano as soon as possible, we saw, him rashing main fights, so a good 25 chapters to close everything if I am generous.
I d say that without any interruption, Luffy will get 5 fully chapters against Kaido, the other small plots will take max half chapters each, with Big Mom vs Kidd&Law max 3 chapters so at worst the main fight in Onigashima will end in 12 chapters.
Starting summer we shall see who is the wiser here?