Hi Junglim， 

If you enable the Smart Zone feature, Netro will water your zones automatically. The "Start Time" and "End Time" on the scheduling page is for customizing start time and end time of smart watering but will not completely ensure to restrict smart watering to a certain period. For example, Netro will still water outside the assigned time if Netro believes the watering duration set by users is not enough. 

To restrict the smart watering to a certain time period, please go to Settings->Restrictions to add a restriction for your zones. 

Thanks, 

Netro Support