I workout 4 days a week. Based on DC Training.
Mon. Chest, Shoulders, Tri's, Back Width and Back Thickness.
Tues. Bi's, Forearms, Calves, Hams and quads.
Wed. off
Thurs. Chest, Shoulders, Tri's, Back Width and Back Thickness.
Friday Bi's, Forearms, Calves, Hams and quads.
Sat. off
Sun. off

Now to get into specifics regarding training. Stay with me here. You are only doing one exercise per muscle group per day. You are doing your first favorite exercise for chest on day one, you're doing your second favorite exercise for chest the next time chest training rolls around and then your third favorite exercise for chest the time after that when chest training rolls around. Then you repeat the entire sequence again. You're doing the same exercises you would be doing anyway in a 7-14 days time and training chest 3 times in that same period with minimal sets so you can recover. You cannot do a 3-5 exercise, 10-20 set chest workout and recover to train chest again 3-4 days later. It's absolutely impossible!! But you can come in and do 2-5 warmup sets up to your heaviest set and then do ONE working set (either straight set or rest paused) all out on that exercise then recover and grow and be ready again 3-4 days later. This kind of training will have you growing as fast as humanly possible. Again the simple equation is "the most times per year you can train a body part incredibly heavy, with major strength gains, and recover will equal out to the fastest accumulation of muscle mass possible".