I'll leave God's definition of days to Him. When you are eternal, hours probably get a little bit longer.
"So the evening and the morning were the first day."
The word used for DAY (yom) only ever means a literal 24 hour period. Every other place it's used to mean a literal day, no one ever questions.
They only question it in Genesis because they are trying to change God's word to fit the THEORIES of anti-God "scientists". Yet the evidence fits a literal six-day creation.
These people are like John Kerry, flip-flopping whenever it suits them.
And when You're eternal, an hour is still an hour. It's not relative. Although time has no meaning to an eternal God, the term still has meaning.