Hi Tom
No it doesn't need to water for 30 minutes but with a timer with a 30 minute on cycle you don't have
much choice but to water for 30 minutes.
What you can do is put a flow control valve to slow the water being pumped to your system to take
30 minutes to fill the garden.
It will also take longer to drain so make sure you consider that when you set your watering cycle.
Ron
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