Satan chained in prison in the Abyss
2 Peter 3:2-14 ~ (written around 63AD, about the same time as Revelation, when those first Christians wondered at its meaning)
You should remember the words spoken beforehand by the holy prophets and the commandment of the Lord and Savior spoken by your apostles. 3 Know this first of all, that in the last days mockers will come with their mocking, following after their own lusts, 4 and saying, "Where is the promise of His coming? ... the present heavens and earth by His word are being reserved for fire, kept for THE DAY OF JUDGMENT and destruction of ungodly men.
8 But do not let this one fact escape your notice, beloved, that WITH THE LORD ONE DAY IS AS A THOUSAND YEARS, AND A THOUSAND YEARS AS ONE DAY. 9 The Lord is not slow about His promise, as some count slowness, but is patient toward you, not wishing for any to perish but for all to come to repentance. 10 But THE DAY OF THE LORD will come like a thief, in which the heavens will pass away with a roar and the elements will be destroyed with intense heat, and the earth and its works will be burned up. 11 Since all these things are to be destroyed in this way, what sort of people ought you to be in holy conduct and godliness, 12 looking for and hastening the coming of THE DAY OF GOD, on account of which the heavens will be destroyed by burning, and the elements will melt with intense heat! 13 But according to His promise we are looking for new heavens and a new earth, in which righteousness dwells.
14 Therefore, beloved, since you look for these things, be diligent to be found by Him in peace, spotless and blameless, 15 and regard the patience of our Lord to be salvation;
DAY OF JUDGMENT = 1 DAY WITH THE LORD = 1000 YEARS = 1 DAY = DAY OF THE LORD = DAY OF GOD
And I saw an angel coming down from heaven, having the key of the abyss and a great chain in his hand. 2 And he laid hold of the dragon, the serpent of old, who is the devil and Satan, and bound him for a THOUSAND YEARS, 3 and threw him into the abyss, and shut it and sealed it over him, so that he should not deceive the nations any longer, until the THOUSAND YEARS were completed; after these things he must be released for a short time.
4 And I saw thrones, and they sat upon them, and judgment was given to them. And I saw the souls of those who had been beheaded because of the testimony of Jesus and because of the word of God, and those who had not worshiped the beast or his image, and had not received the mark upon their forehead and upon their hand; and they came to life and reigned with Christ for a THOUSAND YEARS. 5 The rest of the dead did not come to life until the thousand years were completed. This is the first resurrection. 6 Blessed and holy is the one who has a part in the first resurrection; over these the second death has no power, but they will be priests of God and of Christ and will reign with Him for a THOUSAND YEARS.
7 And when the THOUSAND YEARS are completed, Satan will be released from his prison, 8 and will come out to deceive the nations which are in the four corners of the earth, Gog and Magog, to gather them together for the war; the number of them is like the sand of the seashore. 9 And they came up on the broad plain of the earth and surrounded the camp of the saints and the beloved city, and fire came down from heaven and devoured them. 10 And the devil who deceived them was thrown into the lake of fire and brimstone, where the beast and the false prophet are also; and they will be tormented day and night forever and ever.
I strongly recommend Parousia: The New Testament Doctrine of Our Lord's Second Coming by J. Stuart Russell
I also recommend one consider again the article here: J.S. Russells Position on the Millennium, the Neglected Third Way of Preterism