Netro's smart watering is calculated based on various factors such as plant type, soil type, and soil moisture conditions. Adjusting the frequency or duration too high may result in water wastage. If you want to strictly water your plants for 30 minutes a day, we suggest set up a program and set the smart watering level as basic level.
Alternatively, you can adjust the flow rate, soil type, or plant type to water your plants for 30 minutes a day,, but we do not recommend these methods as they may deviate from the actual zone information.
For more information about Netro smart watering, here is an article about Netro three watering modes which might be helpful. https://netrohome.com/forum/posts/111