According to Genesis, how long did the rain last in the Noah's Ark flood story?

According to Genesis, rain lasted 40 days and 40 nights in the Noah's Ark flood story.

Genesis 7:12 gives this duration after Noah, his family, and the animals enter the ark. The phrase describes the period of continuous rainfall at the beginning of the flood narrative.

The 40-day period is often confused with the 150 days during which the floodwaters prevailed. Genesis uses both numbers, but they refer to different parts of the story: rain falls for 40 days and nights, while the waters remain dominant for a much longer period.

The number 40 also appears repeatedly elsewhere in biblical narratives, including Moses' time on Mount Sinai and Israel's wilderness journey. In the flood account, however, the specific rainfall duration is 40 days and 40 nights.