Running Bubble ponics, beacuse of the drip thing is differnt, This is what I did in DWC which is the same, just no drip.

I raised the level of the water to just bellow the level of the rockwool cube (Like 1cm bellow it), that meanse it was covering the bottom of the net pots. this kept the cube damp and once roots started to grow outside of the pots I started to lower the water level untill it was the 1" bellow the net pot.

Using Bubble Ponics and there drip, you may not have to do this, but I can't suggest drip times for you, as I have not used the system.

Regardles of what you do, you want to keep that air stone running 24/7. if the water is left sit it will go stagnant and breed all sorts of nasty Bactira.
Good luck.