I have been in US for a couple of years on F1 visa which expires in August this year. However I am currently enrolled in a PhD program and I need to renew it. I cannot go to India in summer and I plan on renewing it in December by visiting India in middle of December. My question is, how long will it take to get the visa renewed? The problem is, I am on a scholarship that requires me to be attend school in third week of January and as a result it will not be possible to return in time if the process takes long. Can someone please help?