Hi! Personally for me I work on my abs every other day. I do my extreme ab workout (that I created on here) in the morning and later in the evening I go to the gym and do my full workout and some more ab exercises. Find what works best for you and your schedule.
Hope this helps!
I'm doing ab workouts 3 time in the week and 3 time i do cardio workouts to loose the rest if the belly fat and ya,...don't forget doing cardio and to change your eating habbits