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I think weeks 2-6 are fine, as are 8-9. In weeks 1, 7, 10, etc, the price for cannabis in China dropped significantly leading me to believe that overpaid Foxconn workers spend around 80% of their allowance on some good buds. Thus, the screens are yellow, green or pink depending of mental 'high' status, i.e. Cloud 7 status.
 
Judging by all previous apple products, every week. The week code of the Apple device does not reflect when the individual parts were made. Unless you know how the supple chain works, its going to be random by the time it is put together by Apple.

I went through this lots of time with regards to MBPs and Imacs, for very person that had a crapped out one made week x, there were hundreds with perfect ones.
 
I had a perfect 32g AT&T week 8... Traded up to a 64g AT&T week 8 with a perfect blue screen, but you could see the screen separating from the top of the display .. A bright white line about 2-3" across.
I now have a perfect week 10 :D
 
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