Xbox Power Supply Replacement Xbox 360 Repair Time/power Supply Replacement?

Xbox 360 repair time/power supply replacement? - xbox power supply replacement

My fried foods of the Xbox 360 has stopped working and that he sent to Microsoft. It was 3 weeks ago. I have no confirmation e-mail or anything and I still havnt had it done again. How long does it usually for a replacement? Is there another way 2 are a free, without waiting for Microsoft?