WHEN WILL THE GREAT TRIBULATION BEGIN ?.................

The Great Tribulation upon the WHOLE WORLD will begin when a loud voice in heaven speaks according to : 

Revelation 12:10-12

"And I heard a loud voice saying in heaven............WOE to the inhabitants of the earth and of the sea !  FOR THE DEVIL HAS COME DOWN UNTO YOU , having great wrath because he knows that HE HAS BUT A SHORT TIME."

Therefore, the Great Tribulation WILL BEGIN upon the whole world when Satan is cast down to earth by the archangel Michael according to :

Revelation 12:9

"And Satan, which deceives the whole world,  and his angels were cast out with him."

The length of the Great Tribulation upon  the whole world  is the same "SHORT TIME"  that Satan has authority upon the earth AFTER HE IS CAST DOWN. The following Scripture tells us exactly how long the Great Tribulation is according to :

Revelation 13:5

"And there was given unto him a mouth speaking great things and b lasphemies, and power was given unto him TO CONTINUE FORTY-TWO MONTHS."

SO, THERE YOU HAVE IT:

Scripture tells us that the Great Tribulation upon the whole world lasts for a period of exactly FORTY-TWO MONTHS after Satan is cast down to earth.  There is NOT ONE single Scripture that supports the mistaken notion that the Great Tribulation lasts for seven years ! There also is NOT ONE single Scripture that tells us that the Great Tribulation BEGINS BEFORE Satan is cast down to earth. 

According to Your Word, come Lord Jesus !