Moshiach and Year 6000

§ Rav Ketina says: Six thousand years is the duration of the world, and it is in ruins for one thousand years...

....During those years when the Holy One, Blessed be He, is destined to renew His world...

§ It is taught in a baraita: Rabbi Eliezer says: The messianic era will be forty years long... Rabbi Elazar ben Azarya says: The messianic era will last seventy years, as it is stated....Rabbi Yehuda HaNasi says: The messianic era will last three generations....

Avimi, son of Rabbi Abbahu, taught: The messianic era for the Jewish people will last seven thousand years... Rav Yehuda says that Shmuel says: The duration of the messianic era is like the duration of the period that runs from the day the world was created until now, i.e., the day when the Messiah will come,.. Rav Naḥman bar Yitzḥak says: The duration of the messianic era is like the duration of the period that runs from the days of Noah until now...

(2) .... But regarding all these matters(events leading up to Mashiach) and similar, no one knows how it will be until it will be. For these matters were unclear in the works of the Prophets. Even the Sages themselves did not have a Tradition regarding these matters and only could attempt to understand the verses. Thus, there were disagreements in these matters. Nevertheless, neither the order that these events will occur nor their details are fundamental to the religion. Thus, a person must never busy himself with the Aggadohs and not dwell on the Midrashim regarding these matters or similar issues. He must not make them into a fundamental For these do not result in either love (for G-d) nor fear (of sin).