I think the turnaround time for Stanford is faster for people who applied after they switched computer systems (sometime around 10/15). It took almost exactly a month for me from the received email to complete as well but people who applied a week after me went complete 5-10 days before me. Odd I think. But I know they had a different system before mid-October so I figure that was the issue. I'd say if it takes more than 4 weeks, call/email them.