Jorge, The two witnesses of Rev.11:3-13 will have their ministry for 1,260 days.
In addition to that when their ministry is underway they have the power to turn the waters into blood and smite the earth with all manner of plagues as often as they choose....and more things they can do as well.  
Then the beast from the abyss will kill them. Then they will lie dead in Jerusalem for three days. Then God will call them up and they will go to heaven at that time. Then there will be an earthquake in Jeusalem in which one tenth of the city was destroyed.
So, when exactly will this ministry of this couple begin? If it has begun already, remember to count out the days until its over....1,260 days.
I think your two witnesses and the bibles two witnesses are not the same persons. Sorry.
Michael L