THGL

I'm looking for a little advice here. I'm not much of a gardener, but the house my wife & I bought a couple of years ago came with some decent landscaping (with a watering system built into it). The system wasn't working when we moved in but I'd got it working now and I need to know a good watering schedule. The system connects to one of the sillcocks so I bought a programmable timer. The timer has 2 preset schedules, M-W-F-Sat-Sun, and T-Th-Sat-Sun; I can also make up my own schedule. I just need to know how often and for how long to water. 20 minutes seems to saturate the ground pretty good. How much water is too much? Should I water MWF + weekends or T-Th + w/e?

A little more info: I'm in Louisville, KY so our rainfall amount is pretty middle of the road. The flower beds are mostly boxwoods, ajuga, monkey grass, hostas & daylillies (and a couple other misc. plants & a couple of trees). The main beds are also in the front of the house so they get full afternoon sun.

Thanks much!

__________________
"The truth is merely an excuse for lack of imagination." - Garak