Sure thing.
The desolation of Jerusalem by the Babylonians was a past "Day of the Lord."
After it happened, the prophet Jeremiah tells us:
Lamentations 1:12
behold, and see if there be any sorrow like unto my sorrow, which is done unto me, wherewith the LORD hath afflicted me in the day of his fierce anger.
Lamentations 2:1
How hath the Lord covered the daughter of Zion with a cloud in his anger, and cast down from heaven unto the earth the beauty of Israel, and remembered not his footstool in the day of his anger
Lamentations 2:21
The young and the old lie on the ground in the streets: my virgins and my young men are fallen by the sword; thou hast slain them in the day of thine anger; thou hast killed, and not pitied.
Lamentations 2:22
Thou hast called as in a solemn day my terrors round about, so that in the day of the LORD'S anger none escaped nor remained
Furthermore, Ezekiel had foretold of this same Day of the Lord against Jerusalem which took place in the 500s BC, saying:
Ezekiel 7:19
They shall cast their silver in the streets, and their gold shall be removed: their silver and their gold shall not be able to deliver them in the day of the wrath of Jehovah: they shall not satisfy their souls, neither fill their bowels: because it is the stumblingblock of their iniquity.
And again, Ezekiel says of this same past Day of the Lord...
Ezekiel 13:2-5
Son of man, prophesy against the prophets of Israel that prophesy, and say thou unto them that prophesy out of their own hearts, Hear ye the word of the LORD; Thus saith the Lord GOD; Woe unto the foolish prophets, that follow their own spirit, and have seen nothing! O Israel, thy prophets are like the foxes in the deserts. Ye have not gone up into the gaps, neither made up the hedge for the house of Israel to stand in the battle in the day of Jehovah.
The prophet Zephaniah also calls the destruction of Jerusalem by the Babylonians "the Day of the Lord."
Zephaniah 1:1 - 1:7
The word of Yahweh which came to Zephaniah, the son of Cushi, the son of Gedaliah, the son of Amariah, the son of Hezekiah, in the days of Josiah, the son of Amon, king of Judah. I will utterly sweep away everything off of the surface of the earth, says Yahweh. I will sweep away man and animal. I will sweep away the birds of the sky, the fish of the sea, and the heaps of rubble with the wicked. I will cut off man from the surface of the earth, says Yahweh. I will stretch out my hand against Judah, and against all the inhabitants of Jerusalem. I will cut off the remnant of Baal from this place: the name of the idolatrous and pagan priests, those who worship the host of the sky on the housetops, those who worship and swear by Yahweh and also swear by Malcam, those who have turned back from following Yahweh, and those who haven't sought Yahweh nor inquired after him. Be silent at the presence of the Lord Yahweh, for the day of Yahweh is at hand. For Yahweh has prepared a sacrifice. He has consecrated his guests.
The Destruction of Babylon by the Medes in 539 BC was also a past "Day of the Lord" according to Isaiah:
Isaiah 13:9-13 Behold, the day of the LORD comes, Cruel, with both wrath and fierce anger, To lay the land desolate; And He will destroy its sinners from it. 10 For the stars of heaven and their constellations Will not give their light; The sun will be darkened in its going forth, And the moon will not cause its light to shine. 11 "I will punish the world for its evil, And the wicked for their iniquity; I will halt the arrogance of the proud, And will lay low the haughtiness of the terrible. 12 I will make a mortal more rare than fine gold, A man more than the golden wedge of Ophir. 13 Therefore I will shake the heavens, And the earth will move out of her place, In the wrath of the LORD of hosts And in the day of His fierce anger.
There we have the classic "Day of the Lord" in scripture. Not one single one time event, but a phrase the prophets used to describe any number of Temporal Judgments, NONE of which lasted only 24 hours.
Not once ever have I insisted anythng of the sort.
What does that mean?
No one is claiming it's 24 hours either.
Each of The past Day of the Lord events I referenced above lasted only a few months to a few years tops.
EVERY verse? Even this one?
Ecclesiastes 6:3-5
3 If a man begets a hundred children and lives many years, so that the days of his years are many, but his soul is not satisfied with goodness, or indeed he has no burial, I say that a [b]stillborn child is better than he— 4 for it comes in vanity and departs in darkness, and its name is covered with darkness. 5 Though it has not seen the sun or known anything, this has more rest than that man, 6 even if he lives a thousand years twice—but has not seen goodness. Do not all go to one place?