When will I get my Xbox 360 back?

I woke up on friday the 28th and turned on my 360, and put in Fallout 3, It said Unreadable disk. i put in Saints Row 2 same thing itried every game i have and same problem. I sent it out to be fixed on Wednesday the 2nd and its the 7th how long will it take to get back. I live in the southern part of Illinois does that make any difference? Please answer this I need an answer.