Compare Mark 13:20 and 2 Baruch 20:1

"... There will be other calamities, but none as great as the fall of Jerusalem. The hyperbole is typical of prophecies of destruction. Lane cites Jeremiah 30:7; Joel 2:2; Baruch 2:2; 1 Maccabees 9:27. Deuteronomy 4:32 echoes the same hyperbole, along with a reference to God’s work at creation. The reference is not gratuitous in Mark 13:19. In this context it not only affirms that God is the creator; it implies that God, not the Roman armies, still controls all that happens. God will therefore determine the time of the judgment on Jerusalem. Again the referent of these verses is blurred, and the description applies also to the great tribulation expected at the end of time. The destruction of Jerusalem was terrible—and one need only read Josephus’s description of it to be moved by its horror—but the coming tribulation will be worse. If God had not cut short the time (i.e., of the coming tribulation), no one would survive it. Nevertheless, God ordains the times, and God has cut short the time of suffering. This is good news not only for Jewish Christians in Judea and Gentile Christians in Rome; it is a reminder of God’s provident compassion. Just as God would not allow the flood to wipe out humanity (Genesis 9:11), so God has a purpose for the elect of the covenant community. Beasley-Murray cautions that while there are parallels to God’s cutting short the time of sinners (1 Enoch 80:2) and hastening the time of the end (4 Ezra 4:26), there are few real parallels to the assertion in 13:20 that God will cut short the time of suffering for the sake of the faithful. Beasley-Murray cites 2 Baruch 20:1, and Evans adds 4Q385 = 4QpsEza, frg 3, lines 3-5, “the days hasten in order that the children of Israel may inherit ... I shall cut short the days and the years.” ..."