@andykelly,
How about our 3D world being a prison along the fourth coordinate, and we just keep bounsing back and front on it. In reality, instead the world has an infinit amount of dimensions, and what we call 15 billion years is just 6 days in reall time or that the "parchment" was created in 6 days, a 3D parchment, with a very short time coordinate that we bounce along. Truelly then we would be a creation that took 6 days to create, but as I said, more likely has the extension 6 days. Or possibly 7 and then it just bounce, "recycled time". That's the only possibility as far as I am concerned that would make that possible.
And that is why we have weeks. Also, what is why the big bang happened. Cause that was the prison gate.
But that would be purely speculations.