The choice of words to communicate the duration of God's creation is significant. In the Hebrew language, there are many words that are used to indicate some form of time. In the Hebrew language there are eleven words to explain a long period of time. If God would have wanted us to understand that His Creation took million of years. He could have used the eleven words that describes a long period of time. But God chose none of those words. He chose the word 'day'. He was consistent how he used it (with a number), He defined the length of the day (evening and morning) and he wrote it down for us on clay tablets (Ten Commandments). What more evidence do we need that God required six literal days to create.