In Genesis, the Flood waters began to recede after 150 days.
Genesis 7:24 says that the waters prevailed upon the earth for 150 days. Genesis 8 then states that God remembered Noah and caused a wind to pass over the earth, after which the waters subsided. The ark came to rest on the mountains of Ararat during the following chronology.
This figure is frequently confused with the forty days and forty nights of rain. Forty days describes the period of rainfall, while 150 days describes how long the waters prevailed. Neither number represents the complete time Noah and the animals remained inside the ark, which lasted longer as the land dried.
The chronology includes several dated milestones, including the Flood’s beginning in Noah’s six-hundredth year and the eventual opening of the ark. These details make the narrative more like a structured timeline than a single undated legend.