it depends on what grow medium you are using as to if you need to cut back on the water cycle. Some run them 24/7 and some run them 15 on every hour with lights off and the full on when the lights are on.

Some run 15 on every hour with the lights on and then 15 on every 2 hours with the lights off.

It depends on what and how you are growing. There are many designs that use drips.

is it a drip recovery system? Maybe a drip to bottom bucket system?