Continuing to think out loud… If JWs mean to indicate that the creative “days” were "thousands of thousands" of years long, they surely do not mean the same for “day” seven. This would indicate that the “days” of the creative week are not the same length! Now, JWs have never said that, have they? I know they say that events started in one day overlapped into the others, but they never indicate the days are different lengths.
Also, millions of years would not be “thousands” of years, by any traditional or mathmatical definition of the term "thousands". I suppose they could mean 999,999 years…. This is all so stupid.