The fourth paragraph on page 30 in the October 1, 2001 WT says this:
"Getting back to Paul's statement in Hebrews, we note that he pointed out that "there remains a sabbath resting for the peoples of God," and he urged his fellow Christians to do their utmost "to enter into that rest." This shows that when Paul wrote those words, "the seventh day" of God's rest, which had started some 4,000 years earlier, was still in progress. It will not end until God's purpose regarding mankind and the earth is completely fulfilled at the end of the Thousand Year Reign of Jesus Christ, who is the "Lord of the sabbath."
They have just implied, once again, that a creative day is equal in length to 7,000 years. They say the seventh creative day began 4,000 years before the 1st century. Add on two thousand years to our day, and another thousand for the Thousand Year Reign, and you get 7,000 years.
Now they have a choice:
a) Claim that creative days are of different lengths
b) Claim that the earth is only 48,000 years old (6 x 7,000 years + another 6,000 years in the seventh day).
This is a mistake. Choice a) is problematic for there is no Biblical support for this idea. And if they claim that earlier creative days are millions of years in length, they will have to explain how they know this.
Choice b) is deadly to them. All those college educated JWs who know the earth has been around far, far, far longer than 48,000 years will do a double-take when they read this paragraph. The WTS has carefull hidden this silly 7,000-year length for a creative day for the past couple of decades. Someone in Writing just let the cat out of the bag again.