I take the 1.8 million/month as an average figure, depending on whether they use four or five weeks in a month.
Also, as high as demand is, they still can't sell 1.8 million in non holiday months, Janauary at best would be like a 500k/500k/500k split by region. November was like 1000k/100k/400k off the top of my head. Its really only December when sales go so insane for everybody that Nintendo had to allocate extra units. So if they've been making 1.8 million/month in Oct-March...
You ship...
1.3 million for Sept
1.3 million for Oct
1.5 million for Nov
1.8 million + the extra 500k from Sept and extra 500k from Oct and the extra 300k from November, to have 3.1 million units for December. You send somewhere between 1.5 to 2.0 million to North America, 400k to 500k to Japan, and Europe/Others gets 600k to 1.2 million
Then for January, you try to satisfy leftover demand in Europe & Japan, with 1.8 million probably just enough to allow for a build up for the Smash/Wii Fit launches
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