The writer just didnt have a clue if the creation took thousands ,millions or billions years.so why record it as 6 days if it wasnt the case?
Genesis1 is in god's view of time, from psalm90 we can infer that the writer thought it was surely longer than one week.
For this ancient culture it was total unnecessary to know the exact time of creation, the main information of Genesis1 is that God is the creator of everything.
6 is a sacred number of this ancient culture, a symbol for completeness.To set up the model for the week and Sabbath.
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