How long was the first day?
What does the Bible say?
There was evening and
Morning, the first day.

There was no sunrise.
There was no sunset.
The sun was not created yet.

There was nothing to mark
The passage of time
Except light and darkness,
Evening and morning
Occurring by God's design.

How long was the first day?
Who but God can say?

God called the light "day" and the darkness he called "night." And there was evening, and there was morning—the first day. Genesis 1:5 NIV