"Some people want to make the Bible fit the ‘big bang’ idea, so theysay that maybe ‘six days’ means ‘six long periods of time’.
But we know that when the creation story says “day”, it means “day”! When God gave Israel the 10 Commandments in Exodus 20, He told the Israelites to work for six days and rest for one, because that’s how He created the world!
God didn’t rest on the seventh day because He was tired,
but so that we would have a good pattern to follow."
CMI