No the Day Of The Lord does not last 1000 earthly years, your personal teaching in error.
One day is a Thousand in 2 Peter 3:8 clearly teaches, there is no earthly time in the Lords eternal realm, nothing more or less
"The Day Of The Lord" will take place at the second coming of Jesus Christ "As A Thief In The Night", as the heavens and earth are dissolved by the Lords fire in judgment.
Verses 13-14 clearly instructs the believer to look for the New Heaven And Earth, not a false 1000 year kingdom on earth.
As God clearly teaches he will return in fire in judgment "That You Disregard"
2 Thessalonians 1:7-8, Luke 17:29-30, Malachi 3:2, Nahum 1:5, Revelation 20:9, Isaiah 24:20, 1 Corinthians 3:13
2 Peter 3:7-14King James Version (KJV)
7 But the heavens and the earth, which are now, by the same word are kept in store, reserved unto fire against the day of judgment and perdition of ungodly men.
8 But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day.
9 The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.
10 But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.
11 Seeing then that all these things shall be dissolved, what manner of persons ought ye to be in all holy conversation and godliness,
12 Looking for and hasting unto the coming of the day of God, wherein the heavens being on fire shall be dissolved, and the elements shall melt with fervent heat?
13 Nevertheless we, according to his promise, look for new heavens and a new earth, wherein dwelleth righteousness.
14 Wherefore, beloved, seeing that ye look for such things, be diligent that ye may be found of him in peace, without spot, and blameless.
8 But, beloved, do not forget this one thing, that with the Lord one day is as a thousand years, and a thousand years as one day.
9 The Lord is not slack concerning His promise, as some count slackness, but is longsuffering toward us, not willing that any should perish but that all should come to repentance.
Consider that 36 inches , 3 ft and 1 yard are the very same distance even though there are number''s 36 , 3 and 1 they are the same
Scripture tells us that a day with the Lord is as 1000 years with mankind, and 1000 years with mankind is as 1 day with the Lord . The spiritual/supernatural realm is the past present and future all in the now, as in there is no difference ,
but just as when we need to make a comparison say, to know how many inches are in a mile we have a basis in which to make a comparison.
Scripture is telling us that the closest we can come to comparing passage of time in the natural realm to that of the supernatural realm is 1000 years in the natural realm is as 1 day in the supernatural realm ,
The scripture is also explaining the how's and why to those who say that God is taking too long to do some things as in drawing the plan of God to a close as so many people are suffering and why doesn't God do something to speed things up to stop the suffering.
Explaining that God is longsuffering that he wants EVERYONE to have the chance to spend eternity with the Creator
When scripture speaks of That Day of the Lord we do not see where it refers to a given day of the week as in Friday or Monday but the scripture in this context is making direct reference to the Day in the Lord is a one thousand year time span as that is the time span of a day in the supernatural realm
This really fits perfectly with Rev 20.
God is telling us that us that after the 1000 years satan is set free for a short time then he and all who he conned into following him are cast into the lake of fire, and death is defeated and from that point on the only realm that will exist is the spiritual/supernatural realm ,
At the end of the Millennium- at the end of THAT Day of the Lord the heavens will pass away with a great noise, and the elements will melt with fervent heat; both the earth and the works that are in it will be burned up
You seem to prefer that the heavens pass away at the very instant the Lords Day begins
which you need to take into account that the piece of the puzzle must line up with the rest of Gods plan of redemption !,
Between the 2 options of heavens passing away at the very instant of the start of the Lords Day and it happening at the end of the Lords Day
the only choice that fits all of scripture of Gods plan of redemption is that the heavens and the earth pass away at the end of the Lord's Day