I understand that concept - it was morning, it was evening, the __ day. What I don't understand is why it HAS to be 24 hours. Is God confined by the conception of time - which is essentially a human construct?
Why would you assume "day" means anything other than "day"? If scripture referenced a carrot, would you argue that it might, possibly, maybe mean some other tuber-like vegetable or other that's maybe, sorta, kinda like a carrot but not really?
Sure, it could mean something other than day but assuming so and even arguing so just doesn't make sense. You have a long roe to hoe establishing that's anything other than ridiculous. Granted, the current science on the subject does lend somewhat to that argument but considering even that is arguable it doesn't lend much. Even if it were beyond doubt...it'd still be in conflict with clearly, plain scripture and thus still suspect, at least.