Six Days later?

So, I checked, and Jesus has just gotten done rebuking Peter at Ceseara Philipi (yeah, I know the spelling is not perfect). Jesus has just taught about his future suffering, and that all must give there life in order to earn it. And "Six Days Later" (NRSV) is the next detail. Then he is transfigured before a few choice witnesses.
Is Mark reflecting back on creation? Is this the final day of the creation retold as the final day of Jesus taking on the mantle of sacrifice? Mark's central motion of earthly ministry leading to the revelation of Jesus's true calling to the cross takes the full six days to become complete. And in the completeness of this new (well, newly revealed) calling, Jesus is transfigured, made clean for his purpose. These are big images that need more working out, but I think it is workable.
I know, where do you get the message for the people out of this. But I just wanted to think about why in the sparcely writting gospel of Mark (It is the shortest) we are given this interesting detail. More OT connections to dwell on as we bring the transfiguration story to the people.