Are you thinking natural speciation or artificial (forced) speciation? How many generations do you think it would take? There was a recent article where another nut jobber was postulating man will split into two groups with in 1200 years I think. The tall attractive intelligent people, where the women are devoid of body hair other than the tops of their heads (I kid you not) and the other group of short stupid hairy people... It boggles the mind to think of how they let these people on any podium to spout this shit. In any case I think it would take fewer generations of forced selective breeding of humans for whatever 'desirable' qualities to speciate than to rely on natural speciation.
For example from wiki...
The best-documented creations of new species in the laboratory were performed in the late 1980s. William Rice and G.W. Salt bred fruit flies, Drosophila melanogaster, using a maze with three different choices such as light/dark and wet/dry. Each generation was placed into the maze, and the groups of flies which came out of two of the eight exits were set apart to breed with each other in their respective groups. After thirty-five generations, the two groups and their offspring would not breed with each other even when doing so was their only opportunity to reproduce.[6]
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