I'd say because it's not actually charging. I wonder if that's a carryover from the Kindle 3's. I've charged mine about ten times since I got it in June and a couple of times it hasn't charged, despite saying it is charging when I plug it in.
Not sure about the Touch's, but my K3 will usually charge in less than four hours.
I'd try unplugging it and doing a reset (if possible) and then plugging it back in.
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