We've been given the 3-4 weeks estimate for Orton being out, but then info came out that he had no torn ligaments and not even a high ankle sprain, but we were not given a new time frame for his retrun. In an interview with Devin Hester, he let out that Orton is feeling much better and might push to start this week versus the Titans.
Hester On Orton: "He's Trying to Come Back This Week" (via mouthpiecesports1)
I don't know how well Orton is or feels, but I'd like to think they would just sit him this week and get him ready for the Packers in two weeks.