water farm ????

how big should my plant be in my waterfarm untill i should water 24/7??? need help with that i dont know if i should leave it on or not

i did hindu kush in a water farm i flowered after it was 18 inches it got to about 3 feet in flower.

i watered it for 15 minutes per hour

and changed the res every 2 weeks
added fert as water dissolved

water farms are great, totally low maintenance.