'Years' in the Bible

And he took the dragon, the old snake, which is the Evil One and Satan, and put chains on him for a thousand years,

And put him into the great deep, and it was shut and locked over him, so that he might put the nations in error no longer, till the thousand years were ended: after this he will be let loose for a little time.

And I saw high seats, and they were seated on them, and the right of judging was given to them: and I saw the souls of those who were put to death for the witness of Jesus, and for the word of God, and those who did not give worship to the beast, or to his image, and had not his mark on their brows or on their hands; and they were living and ruling with Christ a thousand years.

The rest of the dead did not come to life again till the thousand years were ended. This is the first coming back from the dead.

Happy and holy is he who has a part in this first coming: over these the second death has no authority, but they will be priests of God and of Christ, and will be ruling with him a thousand years.

And when the thousand years are ended, Satan will be let loose out of his prison,