At the Catholic university I graduated from, the prof of Theology was a Jesuit priest-he was very popular because he answered questions in a sensible, pragmatic matter-when asked about the difference between the Biblical and scientific timelines concerning the Earth and the historical events/records, his answer was “God is the Supreme Being-the Creator and architect of all things-who knows the length of a day in the Eye of God?”
The Hebrew word for “day,” “yom” I believe it is, refers to a normal 24 hour day throughout scripture. Nothing hard to understand about it.
Words mean things.