I lodged a petition for my sister in May. After that, I received a letter from USCIS, which was issued on May 29, 2013. Now if I check my status with the receipt number, it shows my file is in Initial Review.
My Questions are:
1. How much time usually it takes to approve the petition? (I'm not talking about the Final Visa or Green Card)
2. Will I receive any other letter asking me to provide more documents before they approve the petition?