In Genesis, the floodwaters prevailed over the earth for 150 days during Noah’s Ark story.
Genesis 7:24 gives this figure after describing the rising waters that cover the mountains and destroy life outside the Ark. Genesis 8 then begins the turning point: God causes a wind to pass over the earth, the waters subside, and the Ark comes to rest. The text therefore distinguishes the 150-day period from the 40 days and nights of rain.
This is one of the chronology details most often compressed in retellings. The rain lasts 40 days and nights, but the waters prevail for 150 days, after which the recession and waiting periods continue. Genesis gives additional dates, including the Ark’s resting in the seventh month and Noah’s exit in the second month of a later year. Biblical translations can differ in calendar terminology, but the 150-day statement itself is consistent in the standard English text.