How long did it take Noah to build the ark?

Noah took at most 100 years to build the ark, being first mentioned in the Bible at 500 years old and stepping on the ark at 600 years old. The exact time it took Noah to build the ark is not specifically mentioned in the Bible.

Assuming the biblical lunar calendar of 360 days, Noah stayed on the ark for roughly 370 days. He brought seven of each kind of animal that was acceptable for sacrifice, or clean. He brought two of each other kind of animal. The Bible claims that the flood was cataclysmic, killing every human worldwide except for Noah and his family, meaning every person alive since is descended from his family.