You should have looked up the link in the original post...
All other irrigation timers only allow for
ONE valve open at a time. This one does two, which
should be sufficient for most situations. You don't have to do everything at once... Dose micros after lights out... Macros before lights on... etc.
In order to have six valves open at the same time, the irrigation controller would need a larger power supply. For irrigation purposes, usually you don't want more than one circuit running at the same time, otherwise the water pressure might go down. In other words, two valves open simultaneously is probably an exception with these sort of devices.