I'm wondering this too. Last time I consciously stopped drinking, it only took a few days and I felt great. This time, it's been 12 days and I'm still tired all the time. That could be from not drinking, or it could be out of depression (which is what made me drink more than I should in the first place). The only thing for certain is that with time, you'll feel better if you keep at the sobriety than if you have a drink.