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

In the six hundredth year of Noah’s life, on the seventeenth day of the second month, all the fountains of the great deep burst forth, and the floodgates of the heavens were opened.

And the waters prevailed upon the earth for 150 days.

The waters receded steadily from the earth, and after 150 days the waters had gone down.

In Noah’s six hundred and first year, on the first day of the first month, the waters had dried up from the earth. So Noah removed the covering from the ark and saw that the surface of the ground was dry.