I've been training for years and have dropped to only 3 workouts a week. at first you can grow doing up to 6 workouts a week,as you get stronger, your body needs more time to recover.
My workouts at the moment
Chest, biceps, triceps
Back and shoulders
Quads, hamstring and calves
I also hit my abs three times a week with three sets. For me this works, for abs you'll have to figure out what works for you.