The Answer from God’s Word:
Although now is already the last days, know that the “last days” is but a name for an age: Just like the Age of Law and the Age of Grace, it refers to an age, and it indicates an entire age, rather than the final few years or months. Yet the last days are quite unlike the Age of Grace and the Age of Law. The work of the last days is not carried out in Israel, but among the Gentiles; it is the conquest before My throne of people from all nations and tribes outside of Israel, so that My glory throughout the universe can fill the entire cosmos. It is so that I can gain greater glory, so that all creatures on earth can pass on My glory to every nation, forever down the generations, and all creatures in heaven and on earth can see all the glory that I have gained on earth. The work carried out during the last days is the work of conquest. It is not the guidance of the lives of all the people on earth, but the conclusion of mankind’s imperishable, millennia-long life of suffering on earth. As a consequence, the work of the last days cannot be like the several thousand years of work in Israel, nor like the decade of work in Judea which then continued for several thousand years until the second incarnation of God. The people of the last days encounter only the reappearance of the Redeemer in the flesh, and they receive the personal work and words of God. It will not be two thousand years before the last days come to an end; they are brief, like the time when Jesus carried out the work of the Age of Grace in Judea. This is because the last days are the conclusion of the entire era. They are the completion and the ending of God’s six-thousand-year management plan, and they conclude mankind’s life journey of suffering. They do not take the whole of mankind into a new age or allow mankind’s life to continue. That would hold no significance for My management plan or the existence of man. If mankind carried on like this, then sooner or later they would be entirely devoured by the devil, and those souls that belong to Me would ultimately be forfeited by its hands. My work lasts for but six thousand years, and I promised that the evil one’s control over the whole of mankind would also be for no more than six thousand years. And so, the time is up. I will neither continue nor delay any longer: During the last days I will vanquish Satan, I will take back all My glory, and I will reclaim all the souls that belong to Me on earth so that these distressed souls may escape from the sea of suffering, and thus will be concluded My entire work on earth.
from “None Who Are of the Flesh Can Escape the Day of Wrath” in The Word Appears in the Flesh