The scholarly consensus among OT scholars is that the first creation story (the Priestly creation story in 1:1-2:4a is a poetic liturgical piece composed for worship in the Jerusalem temple to justify Sabbath rest. These scholars point to the poetic liturgical repetition: "And God said...And it was so...And God saw that it was good... Evening came, morning followed, the first (2nd, etc.) day.
2 facts demonstrate that 7 24-hour days are not envisaged here.
(1) The evening-morning transition is based on the rotatation of the Earth as it revolves around the sun. But in this story the sun is not even created until the 4th day! So the evening-morning transition makes no sense for earlier days of creation.
(2) The pattern of the 7th day breaks the pattern because the expected phrase "Evening came, morning followed the 7th day is omitted. Why? Because there is not transition from the 7th day to the 8th day, and so on, and so, we are still living in the 7th day.
2 facts demonstrate that 7 24-hour days are not envisaged here.
(1) The evening-morning transition is based on the rotatation of the Earth as it revolves around the sun. But in this story the sun is not even created until the 4th day! So the evening-morning transition makes no sense for earlier days of creation.
(2) The pattern of the 7th day breaks the pattern because the expected phrase "Evening came, morning followed the 7th day is omitted. Why? Because there is not transition from the 7th day to the 8th day, and so on, and so, we are still living in the 7th day.