For those of you out here sending stand alone I-130 for consular processing, can you please share your experience ?

I filed an I-130 for my mother and I want to know how long it takes for the I-130 to be approved.

Please, help. The case will be processed at Vermont Service Center
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I-130 for Mother of USC for CP
1 Sent 10/01/08
2 Approved 11/05/08
3 NVC Case # assigned 11/10/08
4 DS3032 & I-864 bill sent by NVC 11/17/08
5 DS3032 returned to NVC 11/20/08
6 DS230 and biographic docs 12/02/08
7 Case completed by NVC 12/16/08
8 Medical 01/19/09
9 Interview 02/03/09
10 Visa Received 02/12/2009
11 Travel to the US 02/28/2009
14 Green Card Received 03/26/2009