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I think the number is eight if the pixels are spread out. If they are very close together then the number is lower.
 
How new is it?
My problem was that there was a live pixel in the middle of the screen, but I had purchased it only 2 hours prior to noticing. The policy is that you can't get the exchange unless you have more, but the manager granted me the exchange since it was a recent purchase and it was in the middle of the screen. (This was at an Apple store BTW)
 
Elan0204 said:
I think the number is eight if the pixels are spread out. If they are very close together then the number is lower.
If I remember from the official repair document that was obtained a while ago 7 or 8 was the number.
 
It varies depending on the display, some are more, some are less than this old one.
3. The number of acceptable pixel anomalies for this system is:

Acceptable Number of Subpixel Anomalies

Bright Up to 3
Dark Up to 5
Combination Up to 7

4. If the number of subpixel anomalies exceeds the acceptable number listed in the above chart, replace the display panel assembly.

Replace

Bright 4 or more
Dark 6 or more
Combination 8 or more
 
Best idea if a person has several pixel problems then take the display into your local Apple Store or Apple reseller. I would imagine it's all in how you approach the problem. A positive pleasant attitude will always be better received.
 
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