As a general rule, if you are working out abs with resistance, then they should not be worked any more than another part of the body (once a week for some, twice a week for others). If you only do standard crunches, sit-ups, leg lifts, etc. but without resistance than you can work them almost everyday. But you will not have as good results and personally I never work any muscle that is sore. I'm a big believer in allowing for recovery.
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