With the iGrow1400 you can Program Scheduled Irrigation to turn the Irrigation channel on for a duration equal to OnTime at up to six start times per day. and have your Irrigation Valves Turn on and off within a specific time window.
Here is a video link - iGrow 1400 Scheduled Irrigation Programming
To program simply hit Enter/Menu -> Program Equipment -> Hit Enter/Menu to highlight Output -> NEXT to scroll over to Equipment type field -> hit + till you display IRR then hit Back. Hit NEXT to highlight the MODE -> hit + till you highlight Scheduled.
on the 1st screen you program the OnTime which would be your watering duration time.
On the 2nd screen you would use set your irrigation times. you would use PREV or NEXT to navigate between fields and + or - to change the time values. you can have up to 6 watering times within a 24hour period, NA is a time slot that is not being used.
NOTE: These times are not astronomically Adjustable.