The schedule is calculated by selecting Compute Observing schedule from the Schedule menu. It can be useful when working on the timings of the scans in the Observe List, or when reading in an observe file that is written in LST stop times, to have JObserve explicitly set the dwell times or durations before scheduling the observations. Note that LST stop times will still be written in the observe file, if this was selected under Starting Conditions. For more information see the JObserve Online Documentation.