A lot of people think that more training (meaning more days in the gym) will help them get more muscular, faster. This is far from the truth. You grow outside the gym, not inside. When you work out, you provide simulation. However, nutrition, rest, and recovery is what helps your muscles grow. Yes, we need the stimulus, but working out 5 days a week is destructive. You don't want your body to be in a state of breakdown. Instead, you want it to be in a state of buildup. That means you need to go with maximal intensity for under an hour with weights only a few times a week. 5, 6, 7 days a week will not get you the body of your dreams. Unless you're using performanc e enhancing drugs or steroids, your body cannot possibly recover from the stress of working out that often; and if you do, it only means that you aren't training intense enough during your time in the gym to create the appropriate stimulus for muscle growth and hypertrophy. So, I find the best regimen to be one where  you go as insanely intense as possible for no more than an hour 2 or 3 days a week, while doing intense sprints and stairs 2 days a week as well. A routine I follow looks like this:

Monday
Back and Shoulders- Supersets; Strip Sets; Drop Sets
1 Set Biceps to Complete Failure
Abs- 6 Set Circuit

Tuesday
5 Minute Warm-Up
15 minutes Stairs- Sprint for 30 seconds, Rest for 30-45 seconds; Repeat
15 Minutes Sprints- Sprint for 5-10 seconds; Rest for 10-20 seconds; Repeat

Wednesday
Off

Thursday:
5 Minute Warm-Up
30 Minute Hill Sprints; Sprint for 30-60 seconds; Rest for 60-90 seconds
5 Minute Cooldown

Friday:
OFF

Saturday
Legs, Chest- Supersets; Strip Sets; Drop Sets
1 Set Triceps to Complete Failure
Abs- 6 Set Circuit

Sunday
OFF