Wow, BLONDIE is amazing, isn't she?
In synopsis:
A. NOWHERE in the Bible does it say specifically how long a creative day is supposed to have been.
B. The 7,000-year-long creative day is NOT something The Watchtower came up with; the idea has floated around in Christendom since well before 1878 and "Pastor" Russell, take a look at the Ussher chronology from the 17th century, you'll see a similar "let's count backwards" methodology, although the WTB&TS and Ussher use different dates and arrive at different conclusions. In fact, if you do the legwork you can find that the idea predates Christianity and Judaism.
But the Watchtower says it shuns false doctrines, so some prehistoric religion must have been visited by the TROOTH FAIRY!
You might find this interesting:
(from http://www.biblebaptistpublications.org/gods7000yearplan.html)
"...A Neglected Doctrine
The idea that God has a 7,000 year plan is not a new one. In fact, it has been around for many centuries. The Epistle of Barnabas taught it in the first century A.D. by stating that “in six days, that is, in six thousand years, all things will be finished . . . This meaneth: when His Son, coming [again], shall destroy the time of the wicked man, and judge the ungodly, and change the-sun, and the moon, and the stars, then shall He truly rest on the seventh day.” (Epistle of Barnabas, XV verses 4-6) Irenaeus taught it in the second century, Commodianus in the third century, and in the fourth century Lactantius wrote that “the world must continue in its present state through six ages, that is, six thousand years . . . at the end of the six thousandth year all wickedness must be abolished from the earth, and righteousness reign for a thousand years…” (The Epitome of the Divine Institutes, Chapter 70)
We quote such authors because we believe they understood what the Bible had taught all along about God’s prophetic plan and that these truths have been neglected for centuries by most scholars and commentators, largely because it was a seemingly insignificant doctrine centuries ago and it is a negative and uncomfortable doctrine to many today. Our position is that a Bible doctrine is a Bible doctrine, regardless of what people think of it, and it should be taught."