If you can even out and balance what areas of the body you work out, you should work out 7 days a week if possible. You can alternate between upper body, and lower body, or do one body part per day throughout the week.
Consitency IS key though, and if you begin to skip your daily work outs, or don't follow your schedule, your body will get a bit confused, and the muscles will not stay active to bulk up.
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