I repeat. We are not discussing what the text MEANS.
We're discussing what it SAYS.
What it SAYS is "days." The nature of the story told lends itself to thinking about normal old "days."
Therefore, it is not inappropriate to consider "literal days" as on of the options when looking for what the story "means."
It is possible to preserve that literal sense of "day" when one considers the relativity of time.
"I repeat. We are not discussing what the text MEANS. We're discussing what it SAYS."
You have to realize how bad that sounds! All sound exegesis is about determining what the text MEANS. People can make it SAY anything!