To change a time window
In the Start Window tab of the New or Change Schedule dialog box, select a time window.
Position the cursor over the end of the window bar. The cursor changes to a two-headed arrow.
Press the left mouse button and drag the time window to the chosen length.
Click OK to save the completed schedule.
More Information
Creating a schedule window in a schedule
Example of schedule duration
Creating time windows on successive days in a schedule
Duplicating or copying a time window in a schedule
Moving a time window in a schedule
Deleting a time window in a schedule
Deleting all time windows in a schedule