Ab training - how many days a week?

[big bx]

How many days a week do you guys train abs?

I've been doing abs everyday, usually 5 sets. It's a different exercise everyday. I keep the rep range 20-30.

Is this correct to try a get my waist smaller?

 

[Bro Bundy]

The best looking abs I ever had I trained everyday.I was doing 500 sit ups in all different angles everyday.I dont know if thats necessary but thats how I liked it

 

[C T J]

abs everyday (different exercises from planks to ghd situps, to pvc paddling, one arm db decline situps etc)
lower back every other day (banded marches, reverse hyper)