This depends on the time of year and the type of heads, or emitters, on your system. In Horseshoe Bay, it is necessary to irrigate during the eight months from March 1 to November 1. You may shut down over the winter. You will irrigate for shorter times in the spring and early fall because of lower temperatures and wetter weather.
The chart below contains approximate run times in minutes which should work for most lawns in full sun with two cycles per week. These times may not work for all landscapes depending on soil or other site conditions, so you should remain ready to make adjustments by adding or subtracting minutes based on your own judgment.
Beds with drought-tolerant plants or turf or beds in shaded areas should be able to run with times set 10 percent less than shown on this chart.