I did a walk-in for my biometrics today at 8:00 am. My original schedule is on Monday Jan 10 at 12noon. Everything went smooth, and no issues at all. The technician told me that it takes only about 3 hours to get the results transmitted.
Dec 8 - mailed N400 to Phoenix AZ lockbox
Dec 10 - delivery confirmation by USPS
Dec 14 - check cashed
Dec 15 = email/text notification by USCIS of received application with receipt number
Dec 17 - received NOA in mail; PD Dec 10
Dec 20 - online status on USCIS website updated to RFE mailed on December 20, 2010
Dec. 28 - FP notice in mail (Jan 10, 2011 appointment)
Jan 7 - Fingerprint walk-in