I don't think you can do intervals within a single day. Smart Cycle could do that but the time between watering may not be long enough for your purpose. I have a similar issue since I have water restrictions that do not allow me to water from 11AM to 7PM. Because of that I have 3 fixed schedules that water at 7AM, 10:30AM, and 7PM every other day. I also utilize Climate & Rain skip. You could set up 4 or 5 schedules that water at various times of the day and set the day schedule to an interval of every other day, or odd days or even days, etc.