According to the manual:
Quote:
Charging should take less than four hours using
a Kindle AC adapter. Charging using 3rd party adapters or via USB should take less than four hours, but may take longer depending on the capability of the hardware.
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I just plugged mine in about 2 hours ago (the battery icon showed it to be very low), and it's still orange. I think the manual is a bit overly optimistic about the charging time.