"While the day of the Lord certainly has a chronological reality to it, the day of the Lord is first and foremost a state of being, a state of illumination, understanding, knowledge, consciousness, and experience. The day of the Lord is the garden of Eden, it’s the sabbath of God, it’s the cessation of the flesh, and the strivings, desires, and anxieties of the carnal mind. It’s the ceasing of trying by soulish strength to think up and work up the nature, will, ways, and purposes of God, and it’s entering instead into the power of His life, light, and glory. It’s the discovering and unveiling of the Christ within! That’s what John discovered in Revelation 20:1-6. He discovered the Most Holy Place. There is a people on the earth today that is beginning to experience the reality and fulfillment of all that the prophets prophesied of through the ages. The third day, the third feast of Israel, and the third realm in God are all pre-figured by the Most Holy Place in the tabernacle of Moses with its dimensions of ten cubits wide, ten cubits long, and ten cubits high — one thousand cubits square! Those dimensions correspond precisely with the “thousand years” of John’s vision, for one thousand is a figure composed of 10 X 10 X 10. Beyond the veil, in the Most Holy Place, the one thousand cubits point to the one thousand years of the reign of God’s elect upon the thrones of judgment. Both measurements are symbolisms representing the reign of Christ and all the holy sons of God in the power of the kingdom of God and the brightness of the day of the Lord!"
Much more in the link:
https://www.godfire.net/eby/rev218.html
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"I do not expect men to love me for pointing out that the understanding of even some who call themselves sons of God has not progressed one whit beyond that of the theologians in the carnal church systems of man in these things! The fact is, the Lord Jesus Christ, the firstborn Son of God, did not preach even one sermon about the “millennium” publicly to the multitudes that followed Him, nor did He teach it privately to His disciples when He opened to them the scriptures and explained the meaning of His parables, either before or after His death and resurrection. And yet, all of His teaching concerned the kingdom of God! Think about it — He was completely silent on this now popular doctrine! The apostles, in their epistles, are likewise stone silent on the subject of a thousand year reign of Christ. The Holy Spirit did show them “things to come,” as Jesus promised, but a thousand year kingdom was never proclaimed as one of those things."
"Do the sons of God reign with Christ for a thousand years, or do they reign throughout all ages until all things are subdued unto the Father, until creation is delivered from the bondage of corruption — meaning the last enemy is destroyed — and God is “all in all”
"Yes, many think Christ will come and reign for a thousand years — and He will, for one thousand years is as a day, and a day is as a thousand years, and that day is the Day of the Lord in your life."
"Individually, the thousand years is the symbol of a time in a person’s walk where he experiences the power and glory of ruling and reigning with Christ in his life."
"The figure ten is a symbol of earthly completeness, so ten times ten times ten, the cube of ten, or a thousand, is merely a symbol of multiple completeness or fullness."
"It is my conviction that it signifies something higher by far and something infinitely more meaningful and glorious than dates on the calendar! The thousand years in our text is the number ten in the third power, signifying a complete and total binding of Satan within man and a complete and total reigning with Christ IN THE FULLNESS OF THE DAY OF THE LORD."