two thoughts:
first I am not a scientist and am a beginning Torah student but here are two questions:
Doesn't G-d create by 'speaking'? Therefore, aren't there 2 phases of creation...God speaks, and then from his words, the things are formed? Could that mean that maybe he took 6 days to speak/conceptualize the world, but then it took thousands/millions/billions/ of years for the work to be done (while he sits back after he spoke)?
Moreover, maybe the word creation could better be the word 'design' or 'conceptualize'...or maybe we need to find better words for creation or break it down into a few different parts. I could see G-d 'designing' the world in six days...or creating a 'blueprint', but then it taking millions of years to complete.
I also thought the point on time being different from the center of the universe/creation and where we are is interesting. Maybe it is like when you swing a bat...at the center, there is only a little distance (which could be related to short the creation time), while the end of the bat moves several feet (which could be the thousands/millions/billions of years) that we perceive.
Anyways, I could just be blabbering here I have little idea of what I'm talking about...maybe he did conceptualize, design, and then create/form the world in 6 days which are similar to the days from our perspective.