"After these things I looked, and behold, a door standing open in heaven."
Determining the Length of the Tribulation
For me, how the books of Daniel and Revelation as well as Matthew Chapter 24 tie together, verify that the Bible is accurate, and the divine word of God. As a person who loves mathematics, I prefer to look at the mathematics first to see if the numbers and calculations agree. The best place to begin is in Revelation 11:2 which states "...for it is given unto the Gentiles: and the holy city shall they tread under foot forty and two months". Now 42 months is approximately 1260 days (i.e. 42 x 30 = 1260). This number is verified in Revelation 13:5, "and power was given unto him [the beast] to continue forty and two months". When you combine the information from Revelation 11:2 and Revelation 13:5, it can be deduced that the duration of one-half of the tribulation will be 1260 days or approximately 3 and 1/2 years. Therefore, the duration of the tribulation is determined to be 7 years or 2520 days.
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Remember, it is more blessed to give than to receive. Acts 20:35, I have shown you in every way, by laboring like this, that you must support the weak. And remember the words of the Lord Jesus, that He said, "It is more blessed to give than to receive".
As He spoke these words, many believed in Him. Then Jesus said to those Jews who believed Him, “If you abide in My word, you are My disciples indeed. And you shall know the truth, and the truth shall make you free.” They answered Him, “We are Abraham’s descendants, and have never been in bondage to anyone. How can you say, ‘You will be made free’?” Jesus answered them, “Most assuredly, I say to you, whoever commits sin is a slave of sin. And a slave does not abide in the house forever, but a son abides forever. Therefore if the Son makes you free, you shall be free indeed.”
The Great Tribulation
And I said unto him, Sir, thou knowest. And he said to me, These are they which came out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb. Therefore are they before the throne of God, and serve him day and night in his temple: and he that sitteth on the throne shall dwell among them. They shall hunger no more, neither thirst any more; neither shall the sun light on them, nor any heat.
Dr. C.I. Scofield, D.D. wrote in his notes concerning Revelation 7:14-16, "From the Scriptures we may deduce that the tribulation will begin with the signing of the covenant to permit the renewal of Jewish sacrifice (Dan. 9:27); it will be a period of unexampled trouble and judgment (see chain ref., Tribulation, Ps.2:5 to Rev. 7:14), and is described in Rev. 6-19; and it will involve the whole earth (Rev.3:10), but it is distinctively "the time of Jacob's trouble" (Jer.30:7). The elements of the great tribulation (the latter half of the seventieth week) are: (1) the cruel reign of the "beast out of the sea" (Rev. 13:1) who, at the beginning of the final three and one-half years, will break his covenant with the Jews (by virtue of which they will have re-established the Temple worship, Dan. 9:27), and show himself in the Temple, demanding that he be worshiped as God( Mt.24:15; 2 Th. 2:4); (2) the active interposition of Satan "having great wrath" (Rev. 12:12), who gives his power to the beast (Rev. 13:4-5); (3) the unprecedented activity of demons (Rev.9:2,11; cp. v. 20); and (4) the terrible bowl judgments of Rev.16.
The tribulation will, nevertheless be a period of salvation. An election out of Israel will be redeemed (Rev. 7:1-4) with an innumerable multitude of Gentiles (v. 9). These are said to have come "out of great tribulation" (v.14). They are not of the priesthood, the Church, to which they seem to stand somewhat in the relation of the Levites to the priests under the Mosaic Covenant. The great tribulation will be followed immediately by the return of Christ in glory, and the events associated therewith (Mt.24:29-30). See Remnant (Isa1:9; Rom. 11:5, note); Beast (Dan. 7:8; Rev. 19:20, note); Armageddon (Rev. 16:14; 19:17, note)."