It's 6-8 weeks, they're not putting him on IR on the off chance that the Packers starting line dies in a plane crash or something and they wind up in the playoffs.
Kind of a pity, it looked like the O-line was starting to pull itself together (5 sacks in the last 6 games, Cutler was on track to have by far the least amount of interceptions in any year), and Forte has been a total boss lately. But so it goes, I guess.
I was hoping that the packers rematch would at least be close, but so much for that.