How long does it take for new species to develop?

Charles Darwin famously marveled at the “endless forms, the most beautiful and wonderful” produced by evolution, and indeed, Soil today is full of a an estimated 1 trillion species. But how long did it take for those species to evolve?

The answer varies widely between life forms, “depending on taxa [type of creature] and environmental conditions,” Thomas Smith, a professor of ecology and evolutionary biology at the University of California, Los Angeles, Gadgetmasti told Gadgetmasti. It ranges from human-observable timescales to tens of millions of years.