it doesn’t say anything about each day being 24 hours, but it summed up each day being comprised of “evening and morning“.
And even though it say nothing about “evening and morning“, it does say the 7th day followed the 6th day, so it is safe to assume the 7th day would also comprised of an “evening” & a “morning”. In the Jewish calendar and custom, is that each new day starts at the beginning of the evening, not at midnight.
the day don’t comprise of years, centuries or ”a thousand of years”.
beside that the Genesis 1 and 2:1-4, is not really history of the earth, but just allegory for the law of sabbath, the day of rest, in Exodus 16.
But neither Genesis 1 creation, nor Genesis 2, are science or history, especially when these two myths contradict each other in the order of creation:
- While Genesis 1 say humans were created last, after the creation of vegetation, after fishes & birds and after land animals.
- Genesis 2 say human was created before vegetation and before animals.
The inconsistencies of the order of creations, showed that they were written by 2 different groups of people.
plus saying the Earth was created before the sun, revealed that people who wrote that have no understanding about about nature, especially that the birds fly in the same ”firmament of the heaven” or the “sky”, as the sun and moon.