if you're looking to build muscle mass, it is too much.
how many exercises / sets / reps do you usually perform? also only 2 days of rest for each muscle group isn't enough.
I'd split it more like this:
Day 1: Chest / Triceps
Day 2: Back / Traps
Day 3: Shoulders / Biceps
Day 4: Legs
Day 5: Rest
Day 6: Rest
Or:
Day 1: Chest / Abs
Day 2: Biceps / Triceps
Day 3: Back / Traps
Day 4: Shoulders
Day 5: Legs
Day 6: Rest
Mix n' match them every several months
