According to the Bible, Noah and his family were in the ark for a little over one year—specifically, 370 days total. Here’s the breakdown from Genesis:
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The rain fell for 40 days and 40 nights (Genesis 7:12).
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The waters prevailed on the earth for 150 days before they began to recede (Genesis 7:24).
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The ark rested on the mountains of Ararat in the seventh month, on the seventeenth day (Genesis 8:4).
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The waters continued to decrease until the tenth month when the tops of the mountains were seen (Genesis 8:5).
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After sending out a raven and then a dove three times, Noah waited until the ground was dry.
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Noah entered the ark on the 17th day of the 2nd month (Genesis 7:11) and left the ark on the 27th day of the 2nd month of the following year (Genesis 8:14).
That equals one year and ten days (360 days in the Hebrew calendar year + 10 extra days) = 370 days in total.
