Verse 12 concludes the episode of sending out the birds from the boat to test the level of the water.

Then he waited another seven days is essentially the same as in verse 10. And she did not return to him any more gave Noah evidence that the bird was again at home on dry land, and that it was now safe for him to leave the boat.

Quoted with permission from Reyburn, William D. and Fry, Euan McG. A Handbook on Genesis. (UBS Helps for Translators). New York: UBS, 1997. For this and other handbooks for translators see here .