H1B-RFE-Premium Process-can anyone know how many days it will take

I had RFE on my H1b visa process on October 10th 2012 and my employer was able to respond to that on November 22nd in premium process.

How many days will it take to get it done? My employer is saying that it will take maximum a week.

I have got an offer and the client is asking me to join ASAP. I have taken 2 weeks time and it is completed.