Jeremiah 29:10

"For thus saith Jehovah, After seventy years are accomplished for Babylon, I will visit you, and perform my good word toward you, in causing you to return to this place. For I know the thoughts that I think toward you, saith Jehovah, thoughts of peace, and not of evil, to give you hope in your latter end. And ye shall call upon me, and ye shall go and pray unto me, and I will hearken unto you. And ye shall seek me, and find me, when ye shall search for me with all your heart. And I will be found of you, saith Jehovah, and I will gather you from all the nations, and I will return again your captivity, and I will gather you from all the nations, and from all the places whither I have driven you, saith Jehovah; and I will bring you again unto the place whence I cause you to be carried away captive."

"After seventy years ... for Babylon ..." (Jeremiah 29:10). Yes, the captivity would end, but not until the seventy years were accomplished. Notice also that there are overtones here that reach unto the end of time. The gathering of God's people from "all the nations" is at the present time taking place in the preaching of the gospel all over the world. There is far more in these verses than the mere return of a few Jews to Jerusalem.

"The accomplishment of the seventy years for Babylon ..." (Jeremiah 29:10). "These words indicate that `the seventy years' are primarily the length of the Babylonian empire, and only in a secondary sense, the length of the Jewish exile."[11] The actual duration of the Babylonian domination was from, "The fall of Nineveh in 612 B.C. to the fall of Babylon in 539 B.C."[12] a period of 73 years. Counting from the accession of Nebuchadnezzar in 606 (Jewish method of reckoning) to the fall of Babylon to Cyrus, there was a period of 67 years. As far as we are concerned, there is no need to talk about "round numbers" in a prophecy as exact as this one.