Correction for the size of a Tennis court
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How big is 150,000,000,000 thousands of circular mills?
It's about 300 times as big as a Tennis court
The size of a Tennis court is about 514,836,960 thousands of circular mills.
(per ITF specification; for doubles)
Per International Tennis Federation Rules of Tennis 2009, a doubles tennis court should measure 23.7744 m long by 10.9728 m, for a total area of about 514,616,440 thousands of circular mills. Courts may be surfaced with crushed red stone, shale, brick, hard-soil grass, or asphalt.