All systems can be left off at night once the plant roots are long enough to reach the nutrient level in the reservoir. Longer cycles depend on the type of system you have:
The cycle can be set to run continuously during the day and coming on once or twice during the night on 15 to 30 minute intervals.
Set the timer to come on for .5 hour/ off 1.5 hour during the daylight cycle once the plant has a good root system. These systems use coco peat which holds moisture and nutrients in the root zone.
WaterFarm, PowerGrower and EcoGrower systems
Set the timer to come on for 1 hour/ off 1 hour during the daylight cycle.
These units are run continuously, especially if you are trying to root cuttings. If you are growing plants, they can be shut off in the evening once the roots have grown into the nutrient solution.
All of our systems can be run 24 hours a day 7 days a week for optimal results, power conservation is the only reason to cycle watering.