"Yohm" can be used for an unspecified period of time. The creative days could not have been 24 hours long.....the creative process was lengthy and the earth itself is old. The Bible does not disagree with that.....some Christians do themselves no favors by hanging onto false beliefs.
The Bible specifies creation in just under a week. We know this in at least two ways.
First, the scriptures say that these days had a sunrise and sunset:
"And God said, “Let there be light,” and there was light. God saw that the light was good, and he separated the light from the darkness. God called the light “day,” and the darkness he called “night.” And there was evening, and there was morning - the first day.
"And God said, “Let there be a vault between the waters to separate water from water.” So God made the vault and separated the water under the vault from the water above it. And it was so. God called the vault “sky.” And there was evening, and there was morning - the second day."
Second, we are commanded to emulate God and rest on the seventh day, which has always been understood to be a 24 hour period, from a Friday sundown to the next sundown on Saturday if you're an orthodox Jew.
I'm surprised to see you call that metaphor given your hostility to evolution. You have to have accepted the science that rules out a literal reading of the Genesis creation story, but not the science supporting evolution. Fundamentalism is usually across the board, not selective.
I have a hypothesis about why the Genesis story occurs over six days followed by a day of rest:
Go back a few millennia, before the advent of the week and the weekend, when people worked every day, and it was likely socially unacceptable for able bodied people not to work every day. Perhaps it was taught that the gods expected it. This was very likely true in man's nomadic days of hunting and gathering, and probably applied even when he settled into a farming and herding life.
Now, fast forward to the advent of monotheism, organized religion, temples, and a priesthood, which would like it to become necessary for every head of the household and probably everybody else as well to periodically come to the temple with shekels to sustain this activity, which meant taking time away from work. I'm guessing that they chose every seventh day then as it still is today.
How do we manufacture support for that idea that it is OK to take a day off if work is considered sacred and holy? Easy. Make taking a day off once a week even holier. In fact, make it a Commandment. Even the Lord rested on the seventh day, and you will, too.
This seems very plausible to me. It explains an otherwise inexplicable and counterproductive idea - that a god needed to work for six days or to rest. That story was written to imitate the cycle in man's life that the priests had concocted.
Another possible clue: Look at how artificial the week is. A day, a month, and a year are each natural units of time reflecting celestial events: one rotation of the earth about its axis, one revolution of the moon around the earth, and one revolution of the earth around the sun.
But these apparently just won't do for this purpose. The day is too short and the month and year too long. And so, the week was created, and with it, the weekend, or Sabbath as it was originally known - a "yom" of rest - a literal 24 hour day just as the Bible writers intended.
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