Flee,

You want to only soak the root system depth of the plants.
Turn on the irrigation and poke down in the soil with your hand or some type of tool to determine when the water gets to the bottom of the roots. Time when you started and stopped. That is what you set for your timer. Time will depend on the growth stage of your plants and how much water your type of plant can tolerate. If the plants are stressing check if it is too much or too little water by probing the root zone. Over time you will learn what your plants need when. Do you need that calculated in gallons per week. I would need your drip flow rate(gph or gpm) to do a calculation for you. JMHO Aloha

Aloha Lehua!

Thanks for the reply. In the process of measuring my gph, I made a startling discovery--the dripline I installed several years ago has lengths of hose with two different gph emitters! About 2/3 have 2gph emitters, while the final stretch has 1gph emitters. Egad! Got a project ahead of me this weekend. :/

Flee,

What is your line length and emitter spacing? What are you going with 1 gph or 2 gph? 2gph will produce shorter irrigation times by half. Aloha