In 1968 it was only a matter of weeks or months...
Why Are You Looking Forward to 1975?
"...30 Are we to assume from this study that the battle of Armageddon will be all over by the autumn of 1975, and the long-looked-for thousand-year reign of Christ will begin by then? Possibly, but we wait to see how closely the seventh thousand-year period of man’s existence coincides with the sabbathlike thousand-year reign of Christ. If these two periods run parallel with each other as to the calendar year, it will not be by mere chance or accident but will be according to Jehovah’s loving and timely purposes. Our chronology, however, which is reasonably accurate (but admittedly not infallible), at the best only points to the autumn of 1975 as the end of 6,000 years of man’s existence on earth. It does not necessarily mean that 1975 marks the end of the first 6,000 years of Jehovah’s seventh creative “day.” Why not? Because after his creation Adam lived some time during the “sixth day,” which unknown amount of time would need to be subtracted from Adam’s 930 years, to determine when the sixth seven-thousand-year period or “day” ended, and how long Adam lived into the “seventh day.” And yet the end of that sixth creative “day” could end within the same Gregorian calendar year of Adam’s creation. It may involve only a difference of weeks or months, not years."
-- The WATCHTOWER, August 15, 1968 page 499.
Today, of course - some 37 years later - we understand so much more about Jehovah's purposes, and we now understand that this was just the specualtion of "some brothers" who happened to work in the Watchtower's writing department in 1968. "Some brothers" with names like "Fred Franz," "Nathan Knorr," "John Barr," "Carey Barber," "Samuel Herd," "Geoffrey Jackson," "Theodore Jaracz," "Steven Lett," "Gerrit Lösch," "Anthony Morris," "Guy Pierce," "Albert Schroeder," "David Splane," and "Daniel Sydlik;" spiritually immature men who were given to following pipe dreams and fantasies, incapable of discerning truth.
Today we can be certain that it is only a matter of weeks or months, not years. In fact, it's just around the corner... oops, sorry, that was the postman.