I believe LPH's reference to 1988 is based on the following:
*** w87 1/1 30 Questions From Readers ***Second, a study of the fulfillment of Bible prophecy and of our location in the stream of time strongly indicate that each of the creative days (Genesis, chapter 1) is 7,000 years long. It is understood that Christ’s reign of a thousand years will bring to a close God’s 7,000-year ‘rest day,’ the last ‘day’ of the creative week. (Revelation 20:6; Genesis 2:2, 3) Based on this reasoning, the entire creative week would be 49,000 years long.
In Awake of November 8, 1982 the following is stated:
*** g82 11/8 7 Science and the Bible ***True, the account goes on to say that huge steps in the development of the earth took one day each. But, in the Bible, “day” can mean more than a twenty-four-hour period. It can mean a thousand years or even longer! (Genesis 2:4; Psalm 90:4) The Bible record, together with verifiable history, indicates that the seventh day of that creative week covers a period of 7,000 years. Hence, each of the six preceding “days” would be of the same length.
This statement is referred to by an article in the Watchtower of 1994, September 1st, in a footnote on page 6. Apparently in 1994 the view that a 'creative day' covers a period of 7,000 years was still valid.
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Every absurdity has a champion to defend it.