In the book Matzmiach Yeshua (He who brings about salvation). there is a passage in which the author reports that the Vilna Gaon zt"l (the genius of Vilnius) (1720-1797) said that the war between Gog and Magog - popularly known as Armageddon outside the Jewish world - will last twelve minutes. In those 12 minutes, one third of the world will die, one third will be injured and one third will survive.May the Redemption come immediately and be'rachamim rabim!
