BraLoD said:
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I mean i got no idea on development timeframes. But they said they started on xiii-2 2 months after release. X-2 development said to have started 6 months after X released.
X-2 officially sold over 4m. vvith the original selling 6.7m, not including the next gen rereleases vvhich have also been quite successful.
http://www.engadget.com/2014/05/09/square-enix-revises-forecasts-sales-exceed-expectations/