How long did it take for you to make Gran Turismo 4?

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North Korea
With Kim Jong Un
Gran Turismo 4 is by no doubt my favorite in the series. As one of the only PS2 games with HD support, 750 cars, and stunning graphics for it's time are just a few of the reasons I love GT4. Anyways, it must have took a long time, so Kaz, how long did it take?
 
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