The Earth is made of elements that were formed in supernovas. We had to have several generations of stars formed out of the remains of older stars that blew th

The Earth is made of elements that were formed in supernovas. We had to have several generations of stars formed out of the remains of older stars that blew themselves apart, to have more than trace amounts of any element apart from hydrogen and helium. Earliest you could get rocky planets is probably a couple of billion years after the Big Bang. But more time is better.