According to 1 Enoch 10.12, the judgement was to occur seventy generations from Enoch, during which time the angels who sinned against God were to be kept in bonds until the day of consummation, the great judgement in which the age shall be consummated. 16.1-2

It should be noted that according to Luke, who claims to have "traced the course of all things accurately from the first", there are exactly seventy generations from Enoch to Jesus Christ. In other words, it would not have been presumptuous for Jude to claim that 1 Enoch addressed the concerns of the Christians to whom he wrote. The generation of Jesus Christ had not yet passed away. 70 AD was within that context. (See Jude 1:6; 14-15)

"And all these things as types did happen to those persons, and they were written for our admonition, upon whom the consummation of the ages did come." (1 Corinthians 10:11)

"Know ye not that we shall judge angels? how much more things that pertain to this life?" (1 Corinthians 6:3)