Hidden in the math of a Fortune summary of a report from investment bank Piper Jaffray: Apple Store sales only account for 2 of every 5 iPhones sold. AT&T stores sell one in five, and overseas phone stores sell the other 2. Using Piper Jaffray's estimates, you can summarize sales for the upcoming Xmas-gift-driven last quarter of the year as: 2 million through Apple's own stores, 1 million through AT&T, and 2 million elsewhere in the world. Then factor in your Best Buy prediction. What I want to know: What's 2 million times the average wait time in an iPhone line? (Chart by Piper Jaffray)

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