Amy VanGerpen (24 Jan 2011)
"RE: Raul D"

Hi Raul,
Actually, there are several reasons why the 2 witnesses' ministry will likley cover most of the second half of the Tribulation as I point out here:
There is one key point that most overlook.  I believe the timing is clearly shown in the context of Revelation 11. 
Revelation 11:1 Then I was given a reed like a measuring rod. And the angel stood, saying, “Rise and measure the temple of God, the altar, and those who worship there. 2 But leave out the court which is outside the temple, and do not measure it, for it has been given to the Gentiles. And they will tread the holy city underfoot for forty-two months. 3 And I will give power to my two witnesses, and they will prophesy one thousand two hundred and sixty days, clothed in sackcloth.”
The 42 months that the holy city will be tread is clearly the same 42 months that the antichrist will rule after the abomination of desolation. The very next verse gives us a more precise time of 1,260 days, which is also 42 months.  It seems to do disservice to the text to say that the 1,260 years came before the 42 months, when the context is tying the time of the treading of the city to the ministry of the two witnesses. 
In addition to the several other reasons I point out in the link above, I am fairly convinced that the ministry of the 2 witnesses will cover most of the "Great Tribulation".   
Amy Van Gerpen
Raul D  (22 Jan 2011)
"2 witnesses and time line of Tribulation"

I heard many theories about when the 2 witnesses come, but i believe they come in the begining of tribulation....