Speciation among primates

Speciation among primates - current estimate for chimp-human split is 5 million years, we're separate species (not interfertile) so it must have taken less than 5 million years. I suspect it takes around 2 million years, depending on generation length. That would indicate that modern humans were interfertile with homo erectus and homo neanderthalis.Modern humans are obviously not speciated. According to the standard biologists' definition of a sub-species/race, that it's merely an in-breeding group visually distinct from other sub-species/races, we are obviously sub-speciated, as any geographically dispersed species will tend to be. -ViL