Revelation 11:3 The 1260 days of the (Two Witnesses) & Revelation 13:1-5 The 42 months of (The Beast) are "Parallel" time frames that will begin at the future revealing of the Antichrist in Jerusalem, resulting in a 3.5 year tribulation
I disagree with your claim there are two little horns, scripture shows one, with Daniel's (Little Horn) being the same as Paul's (Man of Sin) and John's (The Beast) all the same future bad guy
I was considering the horns, and there was another horn, a little one, coming up among them, before whom three of the first horns were plucked out by the roots. And there, in this horn, were eyes like the eyes of a man, and a mouth speaking pompous words.
And out of one of them came a little horn which grew exceedingly great toward the south, toward the east, and toward the Glorious Land.
Chapter 7 is the one you are talking about. Chapter 8 is a foreshadow of the future one. But he is Greek.