This is old, but looks like it still applies based on the range of TSC processing.
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News
INS Service Center addresses I-485 Delays
February 1, 2001 -- In a recent exchange between the INS Service Center in Texas (TSC) and the American Immigration Lawyers Association, the TSC acknowledged that its published “processing time” is actually an average of all the cases. “The TSC is currently adjudicating cases filed both before and after the date identified in time reports. The published processing time report for I-485 adjudications reflects an average adjudication date,” the TSC stated.
For applicants, this means that the published processing times only provide a very rough estimate. If one’s application is pending beyond the published processing time, it may only mean that that case is below the average (or it may mean that the application has been misplaced). Timely follow up on cases beyond the published date is the best means we have to advance the slow cases or determine that the case needs to be found.
http://www.usabal.com/news/2001/01feb01.html
------------------------------------------
News
INS Service Center addresses I-485 Delays
February 1, 2001 -- In a recent exchange between the INS Service Center in Texas (TSC) and the American Immigration Lawyers Association, the TSC acknowledged that its published “processing time” is actually an average of all the cases. “The TSC is currently adjudicating cases filed both before and after the date identified in time reports. The published processing time report for I-485 adjudications reflects an average adjudication date,” the TSC stated.
For applicants, this means that the published processing times only provide a very rough estimate. If one’s application is pending beyond the published processing time, it may only mean that that case is below the average (or it may mean that the application has been misplaced). Timely follow up on cases beyond the published date is the best means we have to advance the slow cases or determine that the case needs to be found.
http://www.usabal.com/news/2001/01feb01.html