The specific "time" that it takes for evolution to occur is iffy since no one has documented how long it takes for a species to turn into a new species. For a small mutation (such as darkness of skin or other race-related bodily features) it shouldn't take as long as a fish turning into a bird. Wouldn't a couple hundred generations be enough to see a fairly wide-spread race of humans? For example, let's say that two white parents have a black kid due to a mutation that the kid gets. That kid, should he end up reproducing, will have the possibility to transfer that aspect to his offspring. Let's say that the black kid ends up having 4 children and one turns out to be black, the same thing happens to that kid and so forth. If this was in an environment that was very sunny then the kid who gets a mutation and becomes black is less susceptible to the harsh sun and is more likely to pass on his genes. It seems possible that that could happen in around 10,000 years. Thoughts?