Hi Narain,
My husband applied for FBI on March 3rd 2012 and received the FBI certificate on April 28th 2012(span of 7-8 weeks approx). When you send your documents to FBI, write a covering letter informing them about your dead line and request them to issue the FBI report at the earliest. Use Fed-ex to send your doc's to WV. You will save time.Once your docs reach FBI, write to them asking the status of your application. Write to them after one month. e-mail id is Liaison@leo.gov . Send it from your gmail id if you have one. We tried sending the email from yahoo but it was not delivered.(said it was in queue). Hope this information helps.
Regards,
Prathima