Similar timescale, but far more pupfish generations. Anyway, discussing speciation with respect to human races, even in the most careful of terms, will generally bring a horde of people accusing you of being a Nazi/whie supremacist/racist, so I ain't going there. That's what we mean when we say we want a 'dialog' on race. It means that if anyone says anything even slightly beyond the standard clichés, we'll tear his tongue out.
Ach sin scéal eile.