One problem with some of the Hunter controllers is that the watering times are controlled by a "solar sync" sensor. This sensor can automatically change the watering times by changing the "seasonal adjust" setting on the controller. So, if you set the watering time for 20 minutes per zone and the "seasonal adjust" setting to 100 percent, you may find that, in a few days, the solar sensor has reset the "seasonal adjust" setting down to 50 percent (or lower) which changes the watering time to 10 minutes per zone. The only way to bypass this sensor is to disconnect the wires to the sensor inside the controller panel. I would suggest that you check the "seasonal adjust" setting on your controller to see if it has reduced the watering times that you originally set. If it is set at 50 percent, then you need to double the watering times. Or, you can reset the seasonal adjust back to 100 percent, but the sensor will readjust it back to 50 percent in a few days.
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