It is believed that it took Noah 120 years to build the ark. This is because of the belief that Noah was 480 years old when he received the order from God, and the flood did not occur until Noah had reached the age of 600.
Noah and seven of his family members were the only people who were on the ark. His family included his wife and three sons, along with his son's wives. Noah also brought a number of animals on the ark after being instructed to bring two of every kind. This was done in order to preserve animal life after the flood.