The question was phrased toward the individual's anecdotal experience rather than clinical studies, and this was my experience. I phrased my answer with "you" in a casual manner. In my experience it took about a month of sobriety to restore both an ability to enjoy life even at times when I normally did not drink(from things like more interest in conversations to more patience) and fully participate mentally, but the most drastic gains were made in the first 2-3 weeks. It's impossible for me to tease out which aspects were psychological versus physical.