It really depends on the requirement of the plant life, soil conditions, weather and etc... You can water your grass real heavy at first and then wait until you see the blades begin to roll or fold in. This indicates the turf needs moisture. Then you can set your controller accordingly. But this is a way to calibrate on southern lawns such as Centipede or St. Augustine. As far as the bedding areas, limit it to keeping the soil moist, but not real wet and be sure to put plenty of mulch or straw to shade the soil and keep moisture in. By doing this, you will train the roots to grow outward and deeper to where the water is and this will create a more drought tolerant landscape.
Josh
Irrigation /Landscape Lighting / Pump and Well Specialist