A thousand million years equals 1 billion years.
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the period after thousand is million ex, 1,200,030 the first comma says million the next comma says thousand
One million is one thousand thousands. Three million is then three thousand thousands.
term millennium
10,000 years. Or rather, Ten Thousand years.
The position immediately to the left of the one thousand place is the ten thousand place, then the one-hundred thousand place, and then the one million place..