Well JRT is the time of day, O29 is how long the valve stays picked to complete the re-sync (I max it out) and O30 is the days between timed re-syncs (JRT)
I do not max this time out. Usually 10-12 is about where I set it. I let the PRSW dictate my time set up then add 2. No sense in letting the car be down for 60 seconds (think that's max) when I may only need 12 to have a good solid resync.
I think 30 is max, 60 would probably be excessive. The pressure switch opens as soon as the weight of the car is on the springs, the jacks don't bottom out immediately. Just my opinion.
10-4 dirt, it's why I always did the +2. Should probably verify on the triple stages though, might need to be PRSW +5 for them slow pigs. Something to play with tomorrow!