The question I get a lot is how many times per week is optimal for growth and even though it really depends on your training split, I think there is a clear right answer.
After years of trial and testing different splits which demanded a set number of training days per week I can tell you with certainty that 5 to 6 days will always yield the best results. It has less to do with the way you structure your training and everything to do with how much time you spend in the gym as well as the attention each muscle group gets.
When you workout less than 5 days a week you end up spending hours in the gym and anyone who is serious about fitness will tell you that it's hard to hit the weights with the intensity needed to grow for long periods. You're better off with shorter workouts that are more intense.
You'll also run into the issue of trying to hit too many muscle groups in one session and you'll run out of mental energy well before those body parts are adequately trained.
At the end of the day you have to find the split that works for you but when it comes to pure growth then 5 - 6 days will get the best results.
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