...254 years would pass before the eighth billion human make the leap.
If you had "oh, the humanity!" lined up by age, oldest to jump first, one would have to consider the possibility that the line would never reach its end! I believe this partially explains why *fecund* is one of my most favorite words ever! I give us a lot of credit!! It's like we don't know to give up!!
If I were invested (along with The Cat) in a pan-Galactic slavery organization, I'd have our harvesting ships visit the Earth once every decade to reap a hundred million in-their-prime humans; talk about low investment, high returns!!
This brings me to the RfM point of this post: will the Church of Jesus Christmas of Laundry-day Saints survive contact with emissaries from the Sultan of Betelguese, when they arrive on Earth to barter for used, but still in good shape, humans?