NET
7 All nations must serve him and his son and grandson until the time comes for his own nation to fall. Then many nations and great kings will in turn subjugate Babylon.
Darby
7 And all the nations shall serve him, and his son, and his son's son, until the time of his land also come, when many nations and great kings shall reduce him to servitude.
KJV
7 And all nations shall serve him, and his son, and his son's son, until the very time of his land come: and then many nations and great kings shall serve themselves of him.