Kichwas
Half-breed
About 40,000 years.Eric Anondson said:(How long have humans been in Europe as original inhabitants without monsters to deal with?)
DNA shows that Europeans, Native Americans, and Asians share a common ancestor who's line is still living in Central Asia (Afghanistan and its neighbors). We all left Africa way back when, went to Central Asia, and there from there all split at around the same time for our seperate continents.
And we -did- have monsters:
Rival humans, Wolf, black bear, and other predators in Europe. Worse in Asia and even still worse in the Americas.
Until the gun, these places were full of creatures that would rip a person into shreds at whim and with ease.
What counts isn't the monsters but the resources (America lacked beasts of burden for example) and the factors needed for advanced civilization: ability to control and disperse food, goods, law, and reproduction.
That's why in -every- developed region on earth that got that developmen in pre modern times (before electricity), settlements are dense - a village every mile or so, where you can walk between them in an afternoon.
They might -also- be vast unsettled wilderness between and around each civilization, but in themselves they are dense.