How much longer will ”Whole Cake Island” arc take?

How long will Oda keep the Whole Cake Arc going? There was news earlier in the year that the Reverie is meant to happen in 2017, as is the start of the Wano Arc.
At the moment all of them are inside Bege and i think we are going to have a bunch of flashbacks, a flashback of Judge( what happened between Germa and the North blue), Big Mom(her encounter with Roger), Gastino and Vegapunk(getting more explanation about the Vinsmokes modification, when they were working on the linage thing that they discovered), some Bege flashback since he mentioned his earlier assassination, maybe how he started this, to be precise why he started this whole assassinations thing because he doesn’t look like a crazy man at all, Brooks connection to the Vinsmokes , and after these flashbacks they will start making some plans to fight their way out of there, so in other words, this arc is still gonna go on for a long time.

*Theory by Saiko_of_the_dark