Prophecy confusing... 3.5 years, 7 years, 10 years, 22 years

Hey Will, that's a great question and I want to second what truthseeker says. She's exactly right.

For starters, I would encourage you to read this post I wrote about prophetic discernment.  It describes a generally applicable Scriptural rule based on 1 Peter 1:20 and also 2 Corinthians 13:1, which says that as a general rule of thumb, if you hear someone suggest an interpretation of Scripture, but there isn't anyone else to back them up, ignore them.  This is so, so important these days because when you start 'Googling' or searching on YouTube you'll find hundreds and hundreds of unique interpretations of the rapture, the tribulation, and all of prophecy for that matter.

The Bible is crystal clear that Scriptural truth is not of private interpretation and it is also crystal clear that everything must be established by two or three witnesses.

The standard seven-year Tribulation theory is widely recognized and Scripturally-defended by Pre-, Mid-, and Post-Trib premillennialists, alike.  That's what I stick to.  Daniel 9 seems pretty unambiguous to me: 69 "weeks" of years transpired from the decree to rebuild Jerusalem (445 or 444 BC) until the Messiah was cut off (probably 33 AD).  That leaves exactly one week of years left (seven years) yet to be fulfilled and sure enough, Daniel 9:27 tells us that the antichrist will confirm a covenant for "one seven".  It's a perfect fit.  Plus the numerous mentions of day counts in Daniel and Revelation seem to line up pretty well with a roughly seven year period of time divided into two halves: 1260 days and 1260/1290/1335 days.

Now, there are certainly those that try to squeeze Christ into this passage by saying He is the one that confirmed a seven-year covenant, and the 3.5 years described therein was His 3.5 year ministry.  However, I don't buy this.  Jesus never made a seven year covenant.  His covenant is explicitly described as "eternal" (see Hebrews 13:20).  In fact, there is nothing in the entire New Testament that could be even remotely described as a seven year period of time related to Christ's life - certainly not any kind of covenant.