Intervals adjust fluidly with Flex Daily, which is the best part about it. It takes some work to make sure that you have the zone set up correctly, but it waters the way you should water, longer durations, less frequently. Not sure what zone you had set up that were running 8 hours, but if you have grass zones with a high precipitation rate, and have cycle soak turned on, the run time will include 30+ minutes of soak for each zone, but actual watering time will be much less.
