How long did it take Noah to build the ark?
Question: How long did it take Noah to build the ark? How old was Noah when he built it and when the flood occurred?
Answer: Before we tackle how long did it take Noah to construct the ark we should cover a little background information about this fascinating man and the incredible feat he accomplished. Noah was born in 2928 B.C. and was 480 years old when God asked him to build a ship to save all the animals and his immediately family. God was bringing a great flood because humans had set their hearts to do evil all of the time (Genesis 6). God gave man one hundred twenty years more to live when he commanded Noah about the ark.
In 2328 B.C., the year of the flood, Noah was six hundred years old (Genesis 9:29). He was a man of faith (Hebrews 11:5 - 7) who walked with God (meaning he obeyed Him and His commandments - see Genesis 6:9 and 1John 2:3 - 6, 5:2 - 3) and who would live a long life of 950 years. It was because he feared the Lord that God chose him to build an ark (ship) to save animals from extinction.
The ark not only was it the biggest ship built up to that time, it would be the largest sailing vessel man would construct until around the 1800's A.D.! It displaced (at a draught of 15 cubits) more than 22,000 tons of water. God told Noah to make a ship that would have over 101,000 square feet (9,383 square meters) of floor space. Because it was built on the 1:6 ratio (50 cubits: 300 cubits) modern naval architecture reveals is the most stable for ocean going vessels, it would be almost impossible to turn the ship over!
Concerning your question about the length of time it took to complete Noah's ship, there is nowhere in Scripture that supports it taking one hundred and twenty years to construct it. This span of time was the period God allowed mankind to live from the time He made His judgment until the flood.