HOW LONG IS A DAY (YOM)?
1.When modified by a numerical or ordinal in historical narrative (359 times in the Old Testament outside of Genesis 1) It always means a literal day.
2.  When modified by “evening and/or morning” (38 times outside of Genesis 1) it always means a literal day.
3.  When used in the plural form – Yamim - (845 times), it always means literal day.
4.  Why didn’t God just say six ages?
5.  The Sabbath command impossible to obey. (Ex 20:11)