One Million

If we assume that sustainable human settlements - with complete civilization infrastructures - can be created with 10,000 multi-intelligent people - then the total number of such settlements at the 2025 population level is about a million (there is close to 10 billion people on earth).

This is consistent with a prototype experimental community of tomorrow at a scale of 10000 people, on 1000 acres or approlimately on a Square Mile.

Regarding land area - one million of such 1000 acre sites would total one billion acres - or 1% of the land mass.