Adam was immortal before the Fall. No one knows how long his immortality lasted because there is no concept of time in a state of forever.
In fact the notion of ‘time’ itself is suspect according to our highest level cosmologists, e.g. Hawkings and colleagues at Cambridge.
A photon travels at the speed of light. At that speed all distances shrink to zero. Therefore from the photons point-of-view it can go to any part of the universe in an instant.
In fact it just so happens that everything we see as light today is just that one single photon appearing at every place in the universe that God desires it to be.
Talk about efficiency!
No such thing as time? What you mean by that?