The context of Exodus 20:8-11 makes it obvious that the author (Moses – also of Genesis 1-2) uses the word “day” to indicate a period of 24 hours. Otherwise we would be laboring for six indefinite eons and resting for one indefinite eon! - Silliness. Also, regarding death: if it’s a natural, built-in, necessary part of our existence (as in evolutionary theory), then we would need no Savior from it.