I have most all zones set for "Flexible Daily" allowing all zones to water "Any Day." There are 16 stations on my first controller, and I have it set to start watering at 10:00 PM because I want the watering to be done before the start time of my second controller starts, which I have set for 2:00 AM. I would like for all zones to be done watering before 5:30 AM when we sometimes get up in our house and begin showers (no water pressure issues). So there are 16 potential stations that can be watered on my first controller. On Monday August 7 in reviewing the schedule set up by Rachio, watering will begin at 10:00 PM and be done at 12:23AM. On Tuesday, August 8 it will start at 10:00 PM and be done at 10:45 PM. On Wednesday, August 9 it will start at 10:00 PM and be done at 12:41 AM. On Thursday, August 10 it will begin at 10:00 PM and be done at 1:49 AM. On Friday, August 11, it will begin at 10:00 PM and be done at 10:45 PM. On Saturday, August 12, it will begin at 10:00 PM and be done at 10:45 PM, On Sunday, August 13, it will begin at 10:00 PM and be done at 1:07 AM. On Monday, August 14, it will begin at 10:00 PM and be done at 1:00 AM, and on and on. I never quite know when my Rachio 16 station controller will be done so that I can start my Rachio 8 station controller and not wonder if there will be overlap between the controllers. This is especially true since if I look at the watering schedule, "Edit Watering Schedule", "Water All Zones" and I look into "Duration," It shows that Rachio could potentially water all zones at once, and the time it would take to do that is 7 hours and 17 minutes. If the two controllers were treated as one 24 station controller by your software in the cloud (it can't be that complicated to make that happen), there would NEVER be overlap between the two stations, and the watering on any given day for all zones set up by the Rachio watering schedule for both controllers would occur in the shortest period of time. There would never have to be a big gap of time between the end of the first controller's watering cycle and the second controllers watering cycle to make sure there is no overlap.