I don’t see anything in Scripture or in real life to suggest the lengths of time used to measure days in ancient times are any different than today. Did the earth orbit differently? Was its path slower?
Though consider just the first billion years following the creation event - long before the formation of galaxies - when the universe was solid with light before photons decoupled. To a "hypothetical" observer "outside" that system, time would seem to be moving very slowly indeed.