It takes about 3 or 4 weeks to approve a RFE case. My friend's case also approved in 3 weeks. I replied my RFEn Oct. 22, online message changed on Oct. 25, and case got approved on or before Nov. 15 (Because the approval letter was mailed on the 15 th, and it takes a few days for INS to mail the letter out).
Do not worry, you will be the next to be approved!!!
gcard02