Quote, paraphrase, and citation #1.

"It took less than an hour to make the atoms, a few hundred million years to make the stars and planets, but five billion years to make man."

It's saying for as long as it took, we're finally here. Giving the times of how long it took to make that thing, it's explaining how the world got here.

http://www.todayinsci.com/QuotationsCategories/B_Cat/BigBang-Quotations.htm