Could Abel have died in God's day six, Gen.4:25; 5:3, Heb.12:22-24, or was it first day of God's day seven?

Adam and Eve were created in the 6th day. Adam and Eve may have even been kicked out of the Garden of Eden while the 6th day was still going on. But since God rested on the 7th day, it is highly unlikely that man's salvation was meant for God's seventh day. Instead, God's seventh day may possibly last forever, since the 6 days speak of God's physical creations, and we have no idea how far those creations go, possibly forever. Man's salvation would not have had to happen if Adam and Eve would not have sinned. I am not sure whether or not there will be an eighth day. The Bible does not speak of it. But we do know that once the 1000 year reign of Christ is over "God will become all things to all people."