Not quite....
It took them around 4 months to complete 22 days of positive work and an additional 4 months to undo 12 days of it.
Extrapolation based on the above (warning: these may contradict Paul Clarke1 's made a few days ago)
In the next four months, INS will be able to move this date forward by 7 days, and in the four months after that, they will retract it by 4 days.... So by april 2004, INS will have completed, at an astounding pace, employment-based I-485 applications with RDs of Aug. 13, 2001!