OK!
We agree it is a long period of time.
The question is: When does it happen?
It happens after Jesus returns as King of kings ( Rev 19:16)
We can not be in His(Jesus) kingdom because He is “at His (The Father)right hand as Prince…”(Acts 5:31). This is why He is at the Father’s right hand and not on the throne.
Mt 24: 21-25
[21] For there shall be then great tribulation, such as hath not been from the beginning of the world until now, neither shall be. [22] And unless those days had been shortened, no flesh should be saved: but for the sake of the elect those days shall be shortened. [23] Then if any man shall say to you: Lo here is Christ, or there, do not believe him. [24] For there shall arise false Christs and false prophets, and shall shew great signs and wonders, insomuch as to deceive (if possible) even the elect. [25] Behold I have told it to you, beforehand.
Mt 24:36-37
[36] But of that day and hour no one knoweth, not the angels of heaven, but the Father alone.{**} [37] And as in the days of Noe, so shall also the coming of the Son of man be.
THIS MEANS:
Jesus who ALONE possesses both a perfect human nature AND always and at the same time His PERFECT Divine Nature, speaks here in his HUMAN nature. YET Jesus is always GOD, and one Person of the Trinity knows, they ALL Know.
John 14: 1-4
[1] Let not your heart be troubled. You believe in God, believe also in me. [2] In my Father’ s house there are many mansions. If not, I would have told you: because I go to prepare a place for you. [3] And if I shall go, and prepare a place for you, I will come again, and will take you to myself; that where I am, you also may be. [4] And whither I go you know, and the way you know"
Your understanding is a bit off the mark.
Upon man’s earthly death, there will be an immediate judgment based on our life’s choices: And Jesus will immediately send our Souls to wither:
Heaven
Purgatory {yes I know you don’t believe it, but that does not change its reality]

Hell
WHAT you address is the Second and Final PUBLIC judgment, when the 1st Judgment will be affirmed :NOT altered], and our Spiritual Immortal souls are reunited with our then made perfect bodies, joined for eternity
The immediate Judgment takes palce and our chosen consequences are effcted immediately upon our death.
Good Works: **James 2: 13-23 **“For judgment is without mercy to one who has shown no mercy; yet mercy triumphs over judgment. What does it profit, my brethren, if a man says he has faith but has not works? Can his faith save him? If a brother or sister is ill-clad and in lack of daily food, and one of you says to them, “Go in peace, be warmed and filled,” without giving them the things needed for the body, what does it profit? So faith by itself, if it has no works, is dead. … You see that faith was active along with his works, and faith was completed by works, …You see that a man is justified by works and not by faith alone. For as the body apart from the spirit is dead, so faith apart from works is dead.”
Heb.6: 10 “For God is not so unjust as to overlook your work and the love which you showed for his sake in serving the saints, as you still do.”
Rev.2: 23 “and I will strike her children dead. And all the churches shall know that I am he who searches mind and heart, and I will give to each of you as your works deserve.”
1 Peter 1: 17 “Now if you invoke as Father him who judges impartially according to each one’s works, conduct yourselves with reverence during the time of your sojourning, “
God Bless you.
PJM