That these were literal days of 24 hours is proved by the fact that the various things created on different days could not usefully exist without each other in their present form for more than a few days.
Kama hizi zilikuwa ni siku halisi za masaaa 24 zimethibitishwa kwa ukweli wa kwamba vitu mbali mbali viliumbwa kwa siku tofauti zisingefaa kuwepo bila kila moja kwa namna yake zilivyopo kwa zaidi ya siku chache.