The 1000 year reign has a beginning and an end.
4: And I saw thrones, and they sat upon them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; and they lived and reigned with Christ a thousand years.
5: But the rest of the dead lived not again until the thousand years were finished. This is the first resurrection.
6: Blessed and holy is he that hath part in the first resurrection: on such the second death hath no power, but they shall be priests of God and of Christ, and shall reign with him a thousand years.
7: And when the thousand years are expired, Satan shall be loosed out of his prison
Rev. 20:4-7
It begins in verse 4 and expires in verse 7. Clear enough.
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