It would be better to do a few different ab workouts to change it up. The problem is if you develop one side of your body too much your body will tilt toward the direction of the stronger muscle. This is why many men have forward tilted postures, they tend to workout the front parts of their bodies more because they notice it when looking in the mirror I guess. Lower back muscles are neglected by most and tend to be weak. Working out your abs is great but you should also workout your lower back so you can maintain good posture. If you workout your abs too much while having a weak lower back you may find yourself bending forward while sitting in a chair.
If you don't have fat covering your abs, sounds like you don't, you should see results pretty quickly. That exercise alone will not do it. You can look up exercise to do and I recommend doing a circuit where you do about 12-15 reps and switch, do them in a circuit and don't stop until you cannot do any more. There are exercises that focus on mainly lower abs as well, don't leave these out because lower abs are the hardest to develop. I would recommend doing a total core workout 3 days a week. Even ab muscles need rest to grow!
Always quality over quantity. Find some good ab workouts and stick to a couple sets. You're always hearing about people who do hundreds of basic, boring crunches and the reality is that they're not doing squat for their abs because they're doing hundreds.
Youtube some ab work outs, get an idea of what you'd like to try/what would target the areas you want, and go for it. Start out slow, with a low number of reps to see how you handle, just so you don't hurt yourself. Then work your way up.
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