2 Weeks seems to be a common breaking point - some people think they've got it licked, and slide back into their addictions, and others have a hard time breaking past that point altogether.
If it's any comfort, another trend I've seen is that after 1 month, a lot of the physical symptoms of withdrawal begin working their way out of your system. I found that Vitamin B1 helped me keep my energy level up (you lose a lot of carbs when you stop drinking, which causes lethargy and can lead to even more depression) - if you're trying to go-it without harsh drugs. See if your doctor has any recommendations.