In the Genesis flood narrative, the floodwaters prevail over the earth for 150 days.
Genesis 7:24 gives the 150-day figure after describing the rising waters. This period is different from the forty days and forty nights of rain. The rain describes the initial downpour, while the 150 days describe the waters’ continued dominance before the process of recession is narrated.
Genesis 8 then says that God remembers Noah, causes a wind to pass over the earth, and begins the waters’ decline. The Ark comes to rest on the mountains of Ararat in the seventh month, and later chronology records further waiting before the ground becomes dry.
Readers sometimes combine the rainfall duration, the period of high water, and the total time Noah spends in the Ark. Genesis presents these as separate chronological details. The text’s flood chronology can also appear different across translations because of calendar terminology and interpretation, but the explicit statement in Genesis 7:24 is 150 days.