A polymorphic self-replicating molecular program could could come up with a lot of different combinations in that amount of time.
Up until 4.2 billion years ago, the highest form of life was the amoeba, a one-celled creature.
The only way we progressed to humans is that the world is not perfect. If it were perfect, the amoeba would have never morphed into anything else.
And if the world were perfect, who would need to buy paper towels for spills?