I'm not arguing the point, I'm simply recognizing that our concept of relative time can hardly be applied to God's concept of time.
I appreciate that.
It is my position that God created the length of our day when He set the physics of our solar system in motion. Prior to having set those dynamics He knew what the length of a day we would have. He uses the term day with proper authority and a pre-creation knowledge of the physics He would use that forms a day for man.
God's commentary regarding creating the universe. Notice how often the creation of the universe is tied to the creation of man, which goes against the theory of a long stretch of time between the creation of the universe and the creation of man:
Isa 45:12 I have made the earth, and created man upon it: I, [even] my hands, have stretched out the heavens, and all their host have I commanded.
Zec 12:1 The burden of the word of the LORD for Israel, saith the LORD, which stretcheth forth the heavens, and layeth the foundation of the earth, and formeth the spirit of man within him.
Isa 42:5 Thus saith God the LORD, he that created the heavens, and stretched them out; he that spread forth the earth, and that which cometh out of it; he that giveth breath unto the people upon it, and spirit to them that walk therein:
Isa 45:18 For thus saith the LORD that created the heavens; God himself that formed the earth and made it; he hath established it, he created it not in vain, he formed it to be inhabited: I [am] the LORD; and [there is] none else.
Isa 64:4 For since the beginning of the world [men] have not heard, nor perceived by the ear, neither hath the eye seen, O God, beside thee, [what] he hath prepared for him that waiteth for him.
Again, more passages speaking about the day Adam was created:
Gen 5:1 This [is] the book of the generations of Adam. In the day that God created man, in the likeness of God made he him;
Mat 19:4 And he answered and said unto them, Have ye not read, that he which made [them] at the beginning made them male and female,
Deu 4:32 For ask now of the days that are past, which were before thee, since the day that God created man upon the earth,