It´s probably me a lot more chapters to skip before they get there. This arc is IMO by all means the Fishman Island equivalent of Skypiea´s Jaya. And Jaya actually also didn´t start at Jaya but with talk about Sky Island. Let´s compare it.
1. Reference to Sky Island through the ship that fell out the sky as well as the Log pointing up/the Log thing and the refence to Fishman Island already happened in Water 7 but right now they are practially on the same spot FI is located (just they were back then for SI).
2. A dumbfuck monkey causes a bit of trouble/a dumbfuck mafioso causes a bit of trouble
3. They head for Jaya in order to find ways to get to Sky Island/they head to the Shanbondie Islands in order to be able to get to Fishman Island.
Ok, on part 2, Shandondie used two chapters more then Jaya but of course that doesn´t matter. The point is that in these beginnings the patterns are practically the same, which is why I find it very unlikely to expect the adventure on Shabondie to be over in three chapters. Add something like 10-12 to the three and I´d say that's more like it.