I would like to thank everyone for their answers and comments, unfortunately at best you explained why some think the Great tribulation is only 3.5 years.
This doesn't explain why many have told me about it being 7 years.
So Best Answer will go to the one who tried his / her best.
Lynnmarie
Favorite Answer
In Daniel 12:7 "a time, times, and an half" has been interpreted as 3 and 1/2 years, which is half of the 7 year tribulation period. Chapter 11 talks about the antichrist.
Also, Revelation 12:6 mentions 1,260 days which I think is 3 and 1/2 years also.
Paul
From misinterpretation of the Bible. That is where Protestants get all their false beliefs.
Your Word is a light to my roadway
I haven't seen anything about seven years of tribulation. If someone says there is, then give the Bible Book, Chapter, and verses.
Doug Catholic
Seven years, mercifully reduced to half of that (42 months) with the last 6 months being the most "exciting". All in the Book of Revelation.
Anonymous
It's maybe mentioned once in the Book of Daniel but some think it's 3.5 years, not seven. Rapture stupids jumped on this and incorporated it into their mythology about the end of the world. You can find all sorts of cray cray blogs and preachers shouting themselves hoarse over this one. But nobody seems able to actually, um, pin down any year when this begins so...mm.