Scripture says it. I agree with Scripture. Including "Immediately".
You said:
"But, the sun being darkened and moon not giving its light and such are said to be things that occur "AFTER the tribulation of those days" is over, not DURING the tribulation of those days, as you are trying to say."
Why did you omit "Immediately"?
Link to the post where I believed that.
Scripture doesn't tell us. Nor does it tell us in the Scriptures I cited from Isaiah and Ezekiel.
What amount of time exactly do you think it represents in the futurized scenario?
Yes. The definition of "then" in verse 30 applicable to the future does not mandate any specific duration.
But a long gap to us may not be a long gap to God.
Speaking for myself, there is no gap after the tribulation of those days and the beginning of what verse 29 is involving. Yet there is gap between what verse 29 is involving and what verse 30 is involving. And what I personally think fits in that gap is the day of Lord and the fulfilling of the seven plagues of the seven angels.
Revelation 21:9 And there came unto me one of the seven angels which had the seven vials full of the seven last plagues, and talked with me, saying, Come hither, I will shew thee the bride, the Lamb's wife.
According to this verse these seven plagues of the seven angels are the seven last plagues. Which implies other plagues preceded them. These other plagues, IMO, meaning these for one----Revelation 11:5 And if any man will hurt them, fire proceedeth out of their mouth, and devoureth their enemies: and if any man will hurt them, he must in this manner be killed. 6 These have power to shut heaven, that it rain not in the days of their prophecy: and have power over waters to turn them to blood, and to smite the earth with all plagues, as often as they will.
What follows is then this.
Revelation 11:7 And when they shall have finished their testimony, the beast that ascendeth out of the bottomless pit shall make war against them, and shall overcome them, and kill them.
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IMO, Revelation 11:7 meaning this---
And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ(Revelation 12:17)
Revelation 11:2
Revelation 13:5-16
a little season, until their fellowservants also and their brethren, that should be killed as they were, should be fulfilled(Revelation 6:11)
--to name a few.
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It is not until this little season is fulfilled first before the last 7 plagues are poured out, though. This little season per my view meaning Matthew 24:15-26, and verse 29 meaning the day of the Lord involving the 7 last plagues.
And since I don't see it being reasonable that Matthew 24:21 is meaning 2000 years ago and that Daniel 12:1 is meaning the final days of this age, I am left to conclude that Matthew 24:21 is involving the final days of this age since that is the era of time Daniel 12:1 is involving. Which then lines up perfectly with my interpretation of Matthew 24:29, that this verse is involving the day of the Lord in the end of this age and is involving the 7 last plagues. And that verse 30 and 31 are involving His coming and the resurrection of the dead and the rapture of the church.