SeiyaxUsagi said:
It wasn't because of Saturn. A fully awoken Metalia poisoned Earth to the point that it forced humanity to go through evolution again and turn the Moon Kingdom to Stone.
Saturn just cleaned up the dead bodies so their souls can reincarnate.
That still means the 3.5 billion years thing is true.
Since starting evolution over implies forming single celled life-AGAIN- and moving up to multi celled organism's and such.
That takes billions of years.
Now if they were knocked back to say, apes, it would only take about 500,000 years or so.
Of course, humans evolving again would NEVER EVER actually happen but whatever, magic is involved.