EB 1 approvals

I am Physician turned Business man in Pharmaceutical business feild with outstanding acheivements and almost 8 international and national awards in recognition of my contributions in the feild of business. I live outside of USA and got my EB1 approved in 21days time in Dec 09. I am looking forward to Consular process now. However, it is taking so long and I applied for I-824 now requesting USCIS to forward the copy of EB1 Approvals to NVC for consular processing. I would like to know how long it might take for me to obtain my Green Card and start living in the United States.