Where do we see 7 years regarding the "Great Tribulation" and do scriptures show there being 3 1/2 years for certain events within the 7 years to occur (at halfway)? Ponder those questions but also note as this video plays that the Prophet Daniel doesn't use the same term for the Great Tribulation period - the final week of years (70th week of Daniel - several descriptive terms). But Jeremiah 30:7 specifically calls it "...the time of Jacob's trouble...". Jacob was re-named "Israel" and his descendants are the Israelites - Jewish Nation. I distinguished between the symbolic woman 'Evil Babylon' (Revelation 17:3) and the symbolic woman who represents Israel (Revelation 12:2) but please be sure to see that distinction. Following are scriptures I read/discuss in this video. - - - -

Revelation 12:6 “And the woman fled into the wilderness, where she hath a place prepared of God, that they should feed her there a thousand two hundred and threescore days (3 1/2 years = 42 months).”

Daniel 9:24 “Seventy sevens" are decreed for your people and your holy city to finish transgression, to put an end to sin, to atone for wickedness, to bring in everlasting righteousness, to seal up vision and prophecy and to anoint the Most Holy Place."

SAME DANIEL SCRIPTURE AS ABOVE BUT IN KJV - - - -
"Seventy weeks are determined upon thy people and upon thy holy city, to finish the transgression, and to make an end of sins, and to make reconciliation for iniquity, and to bring in everlasting righteousness, and to seal up the vision and prophecy, and to anoint the most Holy." - (Only 1 of the 70 weeks of years are left to be fulfilled).

Drop down to verse 27 of Daniel 9, which says: "And he shall confirm the covenant with many for one week: and in the midst of the week he shall cause the sacrifice and the oblation to cease, and for the overspreading of abominations he shall make it desolate, even until the consummation, and that determined shall be poured upon the desolate."

1 Thessalonians 5:3 "For when they shall say, Peace and safety; then sudden destruction cometh upon them, as travail upon a woman with child; and they shall not escape."

Jesus Characterized these 7 years, in this way: - - -
Matthew 24:21 "For then shall be great tribulation, such as was not since the beginning of the world to this time, no, nor ever shall be."

Video Link:
https://youtu.be/D98AQXO64Bo

Author's Bio: 

I am a graduate of Liberty University (1996) for completion of theological studies (33 college credits), and I completed "Bible Survey" with Assemblies of God - Berean College. I consider myself a "Bapticostal" (a Baptist also having Pentecostal beliefs). Bible studies are one of my most-covered book subjects. I am, however, careful to only address those subjects I believe God has given me correct revelation on. I was a Christian Youth Minister, beginning in 1983 for approximately 18 years. During, between and after youth ministries I served in other church capacities as well, including interim pastoring and retirement home ministry. MOST IMPOTANTLY, I am a redeemed man, who has received salvation by acceptance of Jesus Christ (John 3:16) and what he did for me in shedding his blood and dying for me on the cross, and in his resurrection from the dead, giving me the promise of eternal life, purely by grace; not due to anything I have done, other than to accept it freely.