Remove your defined master zone, then set it as a parallel zone (disable ‘sequential’ flag). Then set the station delay time to be the desired amount of time to build up pressure you need for the master zone.
In a program, schedule it for the total duration time as necessary, which sums up each zone’s run time plus each station delay time between two zones. That way, the master zone runs in parallel with the other zones, and lasts for the entire program run.
In the future, please try to post the same question in the same thread, instead of spreading them over multiple threads.