User blog comment:Ghmorello/Chapter 925: The King And Queen Of Thanksgiving/@comment-26369387-20181123221945/@comment-3185063-20181124002529

2.2 billion is still quite high considering the highest a Yonko commander has so far is Katakuri's 1.05 billion, which will probably be surpassed by Queen and King.

I suspect the highest active bounty will be 3 billion, and will be held by Dragon as the Most Wanted Man in the World, and following that being Shanks, Kaido, Big Mom and finally Blackbeard (since he is the newest Yonko and his starting bounty was zero)