Comment We are not even the first on earth (Score 1) 686
Do not forget that there were several extinction level events here on earth, spanning millions of years.
So it is not the case that it took so long for us to "evolve". It was just a case of luck that nature wiped out the last owners for us. Who is to say how the original higher life forms on earth would have evolved had they not been wiped out so many millions of years ago.
Of course, we do not know if it is true or not, but "they" think that life started very quickly after the conditions of the planet were conducive. I expect the same is true on any planet.