Among those of us who submitted earlier, some waited a week to get an invite, while others waited 2 or more weeks. Also, as you get closer to the Oct 5th ED deadline, the sheer volume could mean you'll have to wait longer for an invite.
I'm not saying it couldn't happen sooner, but I do think its a bit soon to start stressing out if you haven't heard anything back 1-2 days after your application goes under review.
Hang in there guys. They WILL respond