xiaobiaotu,please come in

I got the update of I-485 that ask for more additional information, but I didn't know what they need at present, my case was in NSC, I-485 relinked from NIW to EB1, I handed EB1 and NIW, I-485 went with NIW at the same time in Sep, 2005. My EB1a approved in April 2006, and NIW was withdrawed. usually how long need to wait after INS recieve my additional information at present? Thanks a lot