How long does it take for the difficulty to re-target?   The Diff has been 11.5ish since early yesterday when the network has was 3+ GH... we are now at 1.6 GH and have been for the past 12 hrs.   CNC's has yet to retarget and its hash fell off of the world over a week ago, wasn't WDC supposed to have licked that problem with short re-target times?