Just listen to your body, I personally do 1 time a week and my body responds well to it. It also somewhat depends on your goals, going for straight mass? General Fitness? It's just like asking the rep question, some people respond better to lower reps heavier weight some higher reps with moderate weight, you have to figure out what works best for YOU.
Personally I used to do twice per week and then switched to 1 time per week and just blasted the muscle and then let it rest (you grow while your resting, not while your in the gym). But then you lead into the question, how long does each muscle take to recover from being worked, thats a personal thing, each person responds differently and and recovers differently from workouts, listen to your body, examine it, pay attention to how its changing and adjust your workout based on those examinations, what works for joe shmoe probably wont work for you. As a general rule I dont recommend my clients that are aiming for hypertrophy (mass) go any more than 2 times per week per muscle group, and if you want to go more than once setup your routine so you work 1.5 times per week, or 3 times per 2 weeks. Just some food for thought.
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