6 months might be more appropriate! It's a really big place with lots to see!! Even then you won't see it all.....
It's a great place to visit!
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Nothing can beat a cross country drive from LA to NY via route 66 in the US
you should give it about 2 - 3 weeks to really enjoy the sights
http://www.rockandrollroadmap.com/gfx/la_sf_ny2.jpg