Flex Daily calculates the required time based on many of the variables, but unless the variables then change, the time will not change. And yes, once the time is calculated, only the frequency changes when the program runs. But it’s actually not a set frequency: Flex Daily simply waits until the soil is as dry as desired, and then waters.
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If that’s case, would I not be safe to just set up the schedule with 0 mins (recommended time) and let the program take over from there? I haven’t really given it the opportunity.
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Well, a recommended or calculated time should never be 0 minutes, and IMHO you should never change the time in a Flex Daily program.