Rabbi Eliezer learns from Tehilim 95:10 that the period of Geula takes 40 years, the time that Am Yisrael was in the Midbar. These are the years of the last generation, which started in 5751, and which inherits the spiritual inclinations of the generation of the Midbar. The years from 5751 onwards are characterized by the 42 journeys described in Parshat Masei. These are years counted from the death of Rabbi Meir Kahane, who so often spoke about forty years.
Rabbi Elazar ben Azarya says that the period of Geula takes 70 years, according to the words of Yeshayahu (23:15). These are years counted from the miraculous liberation of Yerushalayim, the years of Keter Yehuda. Today we count 42 years.
Rebbi says that the period of Geula takes three generations. He learns this from Tehilim 72:5: "They shall fear you with the Sun and in view of the Moon, a generation and generations." These are the three cycles of the Sun that bring the Tikkunim of Zeir Anpin that define the Geula, from the Samech of 60 in year 5727 until the Samech of 72, three times 28 years later, two times 42.
Combining the teaching of Rabbi Eliezer with the teaching of Rebbi, we deduce that also from the creation of the State of Israel there is a period spanning 84 years: 42 years of the generation until but not including 5751, followed by 42 years of "the last generation," from 5751 onwards.
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