Exodus 20:9 Six days shalt thou labour, and do all they work.
Verse 9 sets the absolute standard definition of 6 literal days in the framework which man shall understand a typical work day and work week, 24 hour day + 6 day work week. Anyone who denies this framework is clearly rejecting God's clear instruction. Verse 10 instructs us about the Sabbath day, a literal 24 hour day, not millions of years. If the Sabbath is clearly understood to be 24 hour day, why cannot the 6 days of the work week be understood.
Now in verse 11, Exodus 20:11 For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the Sabbath day...
What! The LORD made everything in 6 literal days and clearly made a comparison between the 24 hour Sabbath and the other 6 literal work week days of verse 9. Only a fool would deny these clear verses.
Theistic evolution is a lie and work of the devil to deceive men who would deny the clear teachings of Exodus 20:9-11 and its accurate description of 6 literal 24 hour days of creation; not six millennium or any other evolutionary creation method.
Exodus 20:9-11 is simply an accurate commentary or exegesis on Genesis 1. Why do you think God put this exegesis here, I contend that with God's perfect understanding of man, He knew it was necessary to ward off men of future days who would deny the literal 6 days of creation. God knew that men would profess to be wise...and they become fools.
For myself, I am less clear on the meaning of the six days. For example they were worded oddly...each was from Evening until Morning, rather than from Evening till Evening. There are several details of the creation narratives in Gensis that do not seem literal to me, such as 3:23