For a #Gentoo patch series requiring Council approval, I've gotten to v4 and have managed to get 2 of the 7 council members to agree.
I don't have enough data to be sure how many revisions it takes for each additional agreement: only that 2 => 4 so I don't know whether looking at landing v14 (n*2), v49 (n^2), v128 (2^n), or v823543 (n^n).