I'd also submit that a "day" of creation isn't necessarily a 24 hour period, although back in the day we all thought it was.
I further note that the description of every "day" ends with "And the evening and the morning were the [nth] day"
Every day except one of them.
“But do not let this one fact escape your notice, beloved, that with the Lord one day is like a thousand years, and a thousand years like one day.” 2 Peter 3:8
“For a thousand years in thy sight are but as yesterday when it is past, and as a watch in the night.” Psalms 90:4