Why can't all of Gen 2 be one day?
"Why can't all of Gen 2 be one day?"
Up until about verse 5, the first section of Gen 2 refers back to the 7 yoms of creation. After that, it starts into the Adam and Eve narrative, which is a separate creation story from Gen 1 to Gen 2:4. Much of the Genesis 2 narrative is drawn from earlier pagan stories.
This would have been a good way to make people comfortable culturally, when instructing them in a new religion. Paul did the same thing with the unknown god.