By default the timer value is set to 0, and the station will remain on for a maximum of 8 hours
This implies that I can go into Manual Mode and set the station to On and it will automatically switch off after 8H or does it mean that I can set it to the max allowed time of 8H?
Checking the above I was able to set my station On time to 9H, 6 minutes and 7 seconds (which is 32767 seconds). Running my OS in Manual Mode for more than 8H didn’t seem to close the valve, it just stayed On.
The default max has probably been removed in the most recent firmware. It was put there previously to prevent leaving the valve on forever. But I think in the most recent firmware it has been set to indefinite until you turn it off.