Well it seems as though Rayo would be further away given how 'long' he was running for, so it would take him a longer amount of time to come back. Considering that he arrived at more or less the same time as the ghost and he had to backtrack. Not that I'm complaining mind you, it just seems the size of the apartment isn't really relevant to how far away Rayo was unless its small enough he had to backtrack or somethin. Maybe its because I was thinking of an apartment complex, like one of those multistory dealios.