Pseudo scientific answer
I\'ve been trying to do the same.
Looking at this forum, it *seems* that many Feb\'01 mailers got their\'s approved (but not all).
It also seems that several April\'01 mailers got approvals, though there are some that just got FP notice.
Assuming same pace for INS processing (which is a very BIG assumption that can easily be false), it would be fair to say 8-10 months is current pace and therefore yours may be approved in 3-5 months.
If you can do AC I-140 (e.g. you belong to Mumbai) consider doing CP which will take you a predictable 4 months or less.