The growth rate required for a group of 70 to grow to 3 million in 430 years is similarly impossible.
My maths hasn't had a good work out lately but using this equation:
(3,000,000 / 70)
1/430 = absolute growth rate
From that I get about 1.025 * per year. That's a growth rate of 2.5% a year. Its very high, but not impossibly high. It would put it on about level with modern day
Qatar and way behind
Liberia on 4.9%
Naturally, it isn't realistic to compare modern day countries with slave races of bronze aged empires...but I don't think it is as impossible as the Sinai desert sustaining 3,000,000 people or realistically moving that amount of people in the first place.
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