In the Genesis Flood account, the waters prevailed on the earth for 150 days.
Genesis 7:24 gives this figure after describing the 40 days and 40 nights of rain. The distinction matters: 40 days refers to the rainfall, while 150 days describes the period during which the floodwaters remained dominant or continued to prevail. Genesis 8 then says that God remembered Noah and that the waters began to recede.
The account uses several time markers, including Noah’s age, the month and day when the Flood began, and the date when the ark came to rest. These markers create a longer chronology than the simple image of rain falling for 40 days.
Some readers combine the numbers and mistakenly treat 40 days as the entire Flood. Others answer 150 days when asked specifically about rainfall. The wording here targets the separate statement in Genesis 7:24. The broader narrative continues beyond 150 days while the land dries and Noah waits before leaving the ark.