How long did the flood last?

How long did the flood last?
The flood lasted 40 days.	The flood lasted 150 days.
Genesis 7:17 And the flood was forty days upon the earth.	Genesis 7:24 And the waters prevailed upon the earth an hundred and fifty days. Genesis 8:3 And the waters returned from off the earth continually: and after the end of the one hundred and fifty days the waters were abated.