What do you not understand about "on the day that Jesus returns" Jesus destroys the armies of the nations that have surrounded, occupy, Jerusalem and have taken half the city as hostages.
So you don't know.
The answer is 3.5 days.From the day the nations kill the two witnesses and capture Jerusalem.3.5 days later the Lord comes to Jerusalem and destroys them.
Revelation 11
11 And after three days and an half the spirit of life from God entered into them, and they stood upon their feet; and great fear fell upon them which saw them.
12 And they heard a great voice from heaven saying unto them, Come up hither. And they ascended up to heaven in a cloud; and their enemies beheld them.
13 And the same hour was there a great earthquake, and the tenth part of the city fell, and in the earthquake were slain of men seven thousand: and the remnant were affrighted, and gave glory to the God of heaven.
14 The second woe is past; and, behold, the third woe cometh quickly.
15 And the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become the kingdoms of our Lord, and of his Christ; and he shall reign for ever and ever.
16 And the four and twenty elders, which sat before God on their seats, fell upon their faces, and worshipped God,
17 Saying, We give thee thanks, O Lord God Almighty, which art, and wast, and art to come; because thou hast taken to thee thy great power, and hast reigned.
18 And the nations were angry, and thy wrath is come, and the time of the dead, that they should be judged, and that thou shouldest give reward unto thy servants the prophets, and to the saints, and them that fear thy name, small and great; and shouldest
destroy them which destroy the earth.
Right there Doug,in verse 18 is where they are destroyed.It doesn't take the Lord 3.5 years to destroy those nations as you have been claiming.They are destroyed right then.
Zech 14
12 And this shall be the plague wherewith the Lord will smite all the people that have fought against Jerusalem; Their flesh shall consume away while they stand upon their feet, and their eyes shall consume away in their holes, and their tongue shall consume away in their mouth.
It doesn't take that long to be consumed.