“Could have been six 24-hour days, or it could have been 6 1-million year eras.”
Perhaps, if we didn’t have contextual clues to settle the matter, it could be a “grey area”, however, the text is quite plain, when it says, for each day of creation, that there was evening, then morning, then the next day. If you want to ignore that and believe it is talking about ages, then you are not trying to interpret what the text says, you are trying to fit the text to what you want it to say.
But like I said, I really don't care either way. However God did it, He did it.