How many years did Noah take to build the Ark?
In Genesis 5 we read:
Then in Genesis 6 we read:
Finally, in Genesis 7 we read:
From these three passages, we can determine the time required for Noah to build the ark.
First, we see Noah began to have sons in his 500th year of life (Gen 5:32). Next, Noah's sons were already alive when the Lord appeared to Noah and gave him instructions to begin building the ark (Gen 6:18). Finally, the flood came in the 600th year of Noah’s life (Gen 7:11).
Therefore, Noah must have spent a maximum of 100 years (and probably slightly less) building the Ark.