Drip systems should run longer than sprinkler systems because they

Drip irrigation applies water to the root zone
of the plants. Deeper watering creates
deeper roots, especially with trees. Deeper
roots provide better anchoring and stability,
protection from hot surface temperatures and
a greater amount of nutrients.
Drip systems should run longer than sprinkler systems
because they deliver water more slowly. Determine the
amount of time to water based on the rate of flow of your drip
emitters, the types of plants you are watering and the
condition of the soil.