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Hi,
I have a KDX =-- had for about 2 months now. There should be no diff in recharge time AC vs USB, as AC adapter converts house current to USB current (kindle only sees external world thru a USB port and its power specs). My experience with recharge is: about 3 hours if batt is fully discharged. As I rarely use KDX to full discharge, it take more usually 1-2 hour to get back to full (green light) charge. I almost always charge via USB. You can read while charging -- just make sure you use the Windows "Safely Remove Hardware" button first (I know nuthin bout Macs). USB cable is not very long (about 6'), and so can be inconvenient when reading in bed. I have bought a longer cable to cope. You can buy compatible cables (USB A to Micro-B) at Amazon, or more generally thru the web.
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