Well, Rich Baker just upadted his blog, saying that the Abyss is the size of 'Jupiter thousands.'
He states that Jupiter has a 80,000 mile diameter, 300 times the size of Earth.
A quick internet perusal shows that Jupiter is almost 89,000 miles in diameter (bigger than he thought), but that is just over 11 times that of Earth, not 300 (relatively much smaller.)
Garnted, it is a whole order of magnitude bigger, which is much better, but I have two issues:
1) 'Thousands' typically implies 1000-9000, so I would instead state 'the Abyss is tens of thousands of miles across.' Even better, state 'The Abyss is an almost unfathomable 100,000 miles across.'
2) Best: Go one more order of magnitude... "The Abyss is an unfathomable hundreds of thousands of miles across.'