It depends on how much muscle you want to gain and if your doing this regularly or not. I usually do it 1 time a day but don't overwork yourself or you'll end up losing muscle from weakened muscle.
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That all depends on the pro. Id give an estimate of 1-2 hours a day. but that doesnt count cardio during pre contest which can be up to 2 hours a session. plus 5-6 meals a day