According to Genesis, Noah lived 350 years after the flood in the Noah's Ark story.
Genesis 9:28 gives this figure after describing Noah's life following the flood. The same passage says Noah lived 950 years in total, making him one of the longest-lived figures in the biblical genealogies.
The 350 years refers specifically to the period after the flood, not Noah's entire lifespan. Adding it to his age when the flood began produces the total lifespan stated later in Genesis.
This number belongs to the biblical account and should not be confused with the 120-year period mentioned earlier in Genesis. That figure is presented before the flood narrative and is interpreted in different ways by readers and scholars; it is not Noah's post-flood lifespan.