You know, I posted this info on another forum, too, and Leon's explanation seems to be the common consensus there also. So I guess the way it was explained to me was wrong - actually, when you figure it with just percentages, Leon's theory makes more sense. Obviously, 30% would be 30 aps at 3 months, 50% would be 50 aps (or 20 additional) after 5 months, 70% would be 70 aps (or another 20) at 7 months, 80% would be 80 aps (or 10 more) at 9 months - with 20 left to process after 9 months.
I obviously have too much time on my hands, so I did a little experiment. I tracked 20 spousal cases that finalized through Buffalo in 2007 from date of AOR until PPR. (I know, just a sampling but it was the best I could do.) Here were the results:
35% (7) were finalized within 3 months (one in only 17 days!)
65% (13) were finalized within 5 months
75% (15) were finalized within 7 months
85% (17) were finalized within 9 months
15% (3) are still outstanding to date
I also tracked 15 spousal cases through Buffalo that were submitted in the first four months of 2008 - same method:
53% (

were finalized within 3 months (fastest was 25 days)
53% (

were still all that had been finalized by the 5 month mark
66% (10) were finalized within 7 months
33% (5) are still outstanding to date . . . 20% (3) of them over 7 months in process and appx 13% (2) over 9 months in process.