I don’t believe he specified “God Days” or “Earth Days” in the account of events. A day is a relative term when comparing the experience of corporeal beings vs an immortal being like God.
Except that the days are punctuated by dark and light and called out, such as “this was the first day”
Man goes to God and asks, “What’s a million years to you?”
God answers, “A second.”
Then the man asks God, “What’s a million dollars to you?”
God answers, “A penny.”
Then the man asks God, “Can I have a penny?”
And God answers, “Sure, in a second.”
I “think” you are trying to say that a day might not be a 24 hour day as we know it.
I have seen a video study on this and according to the bible, there is no doubt that God meant a 24 hour day.
Genesis 1:5.
“5 God called the light “day,” and the darkness he called “night.” And there was evening, and there was morning—the first day.”
Genesis 1:8
.......”And there was evening, and there was morning—the second day. “
Genesis 1:13
“And there was evening, and there was morning—the third day.”
Genesis 1:16-19
“God made two great lights—the greater light to govern the day and the lesser light to govern the night. He also made the stars. 17 God set them in the vault of the sky to give light on the earth, 18 to govern the day and the night, and to separate light from darkness. And God saw that it was good. 19 And there was evening, and there was morning—the fourth day. .”
Genesis 1:23
“And there was evening, and there was morning—the fifth day.”
Genesis 1:31
........ “And there was evening, and there was morning—the sixth day.