I'm having difficulty describing what i mean, and because of this, cannot do a proper google search. But let's be self racist. I'm asian. How long did it take for us to get slanty eyes?
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I don't know how long it took. Maybe more rounded or western eyes evolved from that slant? I found this, if it helps...
https://uk.answers.yahoo.com/question/index?qid=20071001080201AAM7lco
"It's called an 'epicanthic fold'. All humans have this feature at an early stage of development in the womb, so the first humans probably had it. It's not just Asians that have it. The oldest known race of humans the Khoisan Bushmen have this eye fold too. They look pretty Chinesey too, with a more golden brown skin colour than the West coast Congoid Africans we are used to seeing in the west. The in theory is that the fold makes the lashes point down to keep the sand out.."
Sorry I can't help with detailed genetics.
John F. Kennedy had epicanthic folds.
That is true, like some other people of Irish descent.
we don't know is the answer, that is why you cannot find it.
And you are just scratching the surface about things we do not know about humans.
I'm no expert on the subject, merely an amateur enthusiast.
Such evolution depends on many factors. If there is no pressure from environment or competing lifeforms to evolve, an organism can stay virtually unchanged for many millions of years.
However, if there is no choice but to evolve or die, evolution can happen very fast (in evolutionary terms). And the smaller, simpler and the faster an organism reproduces, the faster evolution can take place. Like for example in bacteria.
I have not verified this, but apparently lizards have been seen do adapt in just 20 generations/15 years ( http://discovermagazine.com/2015/march/19-life-in-the-fast-lane )
I recommend reading "The selfish gene" by Richard Dawkins (The book that made him famous), preferably the latest edition where he brings new discoveries into the context.
That's the good book. Not the other one.
"Not the other one"
Which one are you referring to?
The Good Book, dummy.
Doh! :D