Ugh the dreadful abs - no just kidding...I LOVE ABS! You should too! It is important that our abdominal wall is strong because it is linked to so many other body parts - such as our back and posture. You will often find that some people train their abdominal wall once a week, others three times a week and for people like me, five times a week. It requires trial and error - you need to know your body type in order to understand its needs. Here's a quick 10 minute ab circuit that I enjoy. I am currently prepping for a show and will post a picture of my abs thus far into my prep, (early on).
BAM! Done! Stay consistent and don't lose hope, abs take a LONG time to build.