Compare that to Terry Pratchett: 22 Discworld novels in the same timeframe, all in the same universe, all hanging together, including hanging together with the previous 18 novels he had written over the previous 13 years.
And full of contradictions.
The effort to write a single consistent story is not O(n), after all. Even if it's only O(n log n), Martin wins:
22 * 300 log 300 =~ 16000
1 * 6000 * log 6000 =~ 22500