I do not believe God created the universe as it currently exists in 6 periods. of 24 hours. I believe he used the laws of physics. It certainly happened quick. But time is not relevant when considering g eternity. Time as we know it is a human creation of measurement unique to our solar system and planet. Humans had to recall and retell the story of creation. They were pretty primative. It was simplified.
Do you discount the possibility that the Holy Spirit moved the writer of Genesis to record it as such?