Well, I received my EAD on April 06,2013 and I went to go apply for my ssn today, and they told me i should've waited 10 days, they put the application through anyway and gave me a receipt saying it could take up to 4 weeks for me to receive a social. Hope its sooner, but I had no idea I had to wait any amount of time. I guess every office is different. Im in Indiana btw