Bible Verses About Years: Length of, during the patriarchal age

In the six hundredth year of Noah’s life, in the second month, on the seventeenth day of the month, on the same day were all the fountains of the great deep broken up, and the windows of heaven were opened.

And the waters prevailed upon the earth a hundred and fifty days.

and the waters returned from off the earth continually: and after the end of a hundred and fifty days the waters decreased.

And it came to pass in the six hundred and first year, in the first month, the first day of the month, the waters were dried up from off the earth: and Noah removed the covering of the ark, and looked, and, behold, the face of the ground was dried.