FP Notice Received

Hi All,
I received the FP1 notice for my wife yesterday, scheduled on 11/12. Meanwhile, she left for India for a Vacation just a week ago. I want to postpone her FP until she comes back (in late Dec.).
My question: is there a timelimit within which one must complete the FP, after the notice has been sent ? Has anybody from the Forum done it before ?
Please share your experiences. I am yet to get my FP notice and am curious if I can complete mine before my wife.
 
I want my GC said:
Received a notice for FP.

I485 ND 12/05/03
I140 ND 12/04/03
I140 Approved 07/09/04

did you do anything that you know of, which might have triggered FP notice. Like sending any kind of renewal application or change of address etc.
 
I actually did change my address in September, but I don't think that triggered any thing since they still sent the FP notice to the old address and a friend of mine who filed I-485 around the same time got his notice to.
 
What is your ASC? My ND is 12/3 and my ASC is Norfolk I guess. One of my friends from my place got in Alexandria though.
 
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