That is right RAsylee,
Lazerthegreat,
for me it took 6 month from FP to Approval.
I think the delay depends on how fast the FBI submit back your name check result (FP is done pretty fast now). the FBI sent my name check result since February, and the INS approved my case in late April.
PS. from my personal experience, I realized that if you call the Customer service line and submit an inquiry to Nebraska, that might work to result in some action in the case. i called them every thirty days (minimum time allowed between calls)the past year, and it always work after 2-3 calls to prompt a move in the case? just my 2 cents idea,,,,,,