Netro breaks the watering into many pieces to avoid water runoff. You can create muliple programs for each zone to water for 4 hours. The maximum watering time for each program is 60 minutes. If you want to water more than 60 minutes, just create another program for this zone.
Thanks for your feedback. Netro smart watering calculates the smart schedules based on environmental conditions including the soil type. If the selected soil type is clay, clay loam or loam which accepts water slowly, often as little as 1/4 inch per hour, Netro will break the watering into many pieces to avoid water runoff.
As a workaround, you could add your own programs to make sure Netro not break up watering.