How long have separate human races existed?

Well, when the Earth was in its youngest stages of life, several different species evolved. However, due to the fact that the Time Lords of the planet Gallifrey had established a morphic field, the races of earth evolved into bipedal and binocular creatures. This also explains how the Silurians, also known as homoreptilia, Sea Devils, and other Earth creatures came into existence.

According to the Racial Research Center of Dubai, races would be further split into categories, such as the 100 meter dash, and the quarter mile.