It totally depends on the person, if you can't just take a week off without feeling negative effects then yeah, cut down a bit. Taking a day off in between drinking nights (or dropping to 1 brew a night every other night if you must) isn't too tough. Keep in mind people, there are a lot of factors that go into figuring what a "serving" is for a person. I find that when I'm training and eating 6 decent-sized meals a day and drinking a lot of water, I'm a TANK and it takes a lot of booze to have an effect on me. At other times, I get buzzed off of only a couple beers. Things like body weight, body composition, age, how much alcohol dehydrogenase your body naturally produces, and a bunch of other criteria factor into the equation, so it's different for everyone.