AP will take 150-180 days in

I-140NIW&I-485 Received on 9/27, check cashed 10/6, NSC

This is the letter for AP application. Why it takes so long (5-6months)? I remembered it only take 2-3 months. Anyone received the same letter if submitted around 10/1?
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Application Type: I131, APPLICATION FOR USCIS TRAVEL DOCUMENT

Current Status:

Your I131 APPLICATION FOR USCIS TRAVEL DOCUMENT was received on October 6, 2005. We mailed you a receipt with information about processing. It is taking between 150 and 180 days for us to process this kind of case. We will mail you a decision as soon as processing is complete.
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所有跟帖： 

• It usu. doesn't take that long -風之河- ♀ (0 bytes) () 10/10/2005 postreply 13:11:27

• 2-3 months to my knowledge -beijinger- ♀ (56 bytes) () 10/10/2005 postreply 18:22:33