"The Bible is clear that God created the universe and everything in it by His
word. God’s creation is a sign of His power—He simply speaks and
it comes into being. It is also a reason for His creation to worship Him:
By the word of Yahweh the heavens were made, and by the breath of his
mouth all their host … For he spoke, and it was done; he commanded, and it stood fast (Psalm 33:6, 9).
You are Yahweh, you alone. You have made heaven, the heaven of heavens, with all their host, the earth and all that is on it, the seas and all that is in them; and you preserve all of them; and the host of heaven worships you (Nehemiah 9:6).
God could have created in any way He wanted, over whatever period of time He wanted.
Q: So why did He create over six days?
Q: And why did He rest on the seventh,
when the Bible is clear that God does not tire?
A: One reason seemed to be so
it could be a model for the Sabbath." CMI