Not all creationists are literalists, you know. Many - if not most - interpret six days to be six phases of creation. Few assume that one day for us is one day for God.
Einstein demonstrated that one day is not one day everywhere in the universe. In fact, in order to say what "one day" is, you have to also specify your inertial reference frame, and unless you count Genesis, nobody has ever demonstrated what God's inertial reference frame is.
We detect particles on the surface of the Earth which based on a simple division of their speed and lab lifetime should never make it down here, but they do because as they're travelling near the speed of light, 200 milliseconds for them is much, much longer for us.
Likewise, 86,400 seconds marked out on a clock at the center of the sun would take longer than one day on Earth to elapse.