The way the system was programmed by the builder is very basic this system is capable of a lot.
There R 3 different systems within it to set 1 or more zones to totally different schedules.
Say you want the front to get 40 minutes
Set program A (front lawn) to 40 starting at 5 AM
U can set it to any days of the week U wish say Tuesday & Friday, or set it to Interval.
Interval is using any number of days in between the days to water rather than set days of the week.
So an interval of 2 is every two days 3 every third day.
There R also upto 4 start times, here's how that works, you want to water a zone 40 minutes, but U see some water not getting absorbed and starting to pool on the surface.
Simple set that zone to 20 minutes rater than 40 but start it at 5AM as above, then give it 2 hour to soak in and start it again 7:30, now U R still giving it 40 minutes of water but more time to get to the roots.
Program B can run the back lawn or side etc, depends on perhaps sun or U don't want your back yard wet in the morning when you want to relax with your coffee, so set that zone to start at 4AM
Program C can run all your plants on a separate schedule.
By the way most experts agree the watering should be done early in the morning, watering at night may result in fungus in your lawns and leaves it dry all day the blistering heat.
Start about 4-6 AM in this time of the year and about 7-8 in the winter.
One more setting (and don't run the system on bypass really looks silly to see it raining with the sprinklers on) there is a % setting which varies thru the year it is the percent of time the sprinklers actually run if set to 75% for example (the builders setting you think U R watering for 40 minutes? no only 30, in the summer this should be set to 95-100%.
There R Utube video's on these settings to.
[ame=http://www.youtube.com/watch?v=_PRtho7XiSA]Hunter X-Core Programming 1 of 2: Overview and Setting Up Program A - YouTube[/ame]
[ame=http://www.youtube.com/watch?v=znT5mIdMSD4]Hunter PRO-C sprinkler controller - YouTube[/ame]
[ame=http://www.youtube.com/watch?v=V9aOb_m1QUM]Webbtraining1 - Hunter Pro C Irrigation Control Timer - YouTube[/ame]
[ame=http://www.youtube.com/watch?v=oUoir-wk2Yc]How To Program Your Irrigation Controller - YouTube[/ame]
I'm sure others can add what I missed here,
PS: most lawn maintenance guys don't know or care to take the time to do this stuff don't depend on them.