Sometimes I have one of my 3 slave stations not receive a command from the master station to turn the valve off. The station will now run until a manually turn it off. It seems like the master station should also send the time that the station should run for so this doesn’t occur.
That’s what it does already. You should check Edit Options -> Advanced -> Special Station Auto-Refresh, and make sure it’s on. This way it will periodically send commands to remote zones to keep them in sync with the master controller.