Population explosion?
It is probably just because Dennis Taylor decided on some random number but is anyone else irked out by the fact that 86 years after Herschel and Neil left Sol in 2259 with the remaining 14 million humans, the human population already blew up to 60 billion in 2345 according to Bill? If one takes into account the travel time for the 14 million to their colonies they maybe had 70 years to propagate. Even if you factor in a generous growth for the already established colonies fom one million to 11 million and low mortality rates each couple would require 20-30 kids at least. (Yes, I asked ChatGPT, sue me ;))