Answer: Determining just how much water to apply can be confusing because the amount of water each plant needs may vary, and different soil types retain more water than others. The important thing is, that the rootmass of each plant should receive sufficient moisture to keep it healthy, One way that you can check to see how efficient your drip system is (or your hand watering practices) is to water as usual and then wait 3-4 days. Dig a hole near the roots of your plant and observe the moisture in the soil. If the soil is moist 3 inches beneath the soil surface, you won't need to water for a few more days; if it is dry, it's time to water again; if it is soggy wet, the soil doesn't drain well and you won't need to water as often. Just how sandy or clayey your soil is (sand=fast drainage; clay=slow drainage), plus the weather, plus the type of plant you're growing. Maybe a practical solution for you with your newly installed plants is to build a watering basin beneath each. Once each week flood the basin with water, allow it to drain, then flood it a second time. Once the roots are established, your drip system should be sufficient.
Best wishes with your landscape!
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