They can get HUGE, I have seen them as big as 6500 grams, and know of ones that have been imported as big as 8100 grams. In Africa they have been reported 9200 grams (about 9 kilo).
There have been 18-21 egg clutches in the U.S and reports of a 27 egg clutch in Ghana.
That is absolutely crazy! Have you run across any pictures of such beasts?