Well, First of all, I believe the seven days were seven literal 24 hour days. Yom meant something particular to a Jew. The context indicates it was a 24 hour day.
As for Adam, there was no death before the fall. Scripture says ALL of creation fell. The consumption of plants was life unto life. Two kinds of death entered into the world at the fall, physical death of which God did first, and spiritual death, which is everlasting torment, for those who refused to believe either in the coming Messiah, or the risen Saviour.