You can quickly adjust the time span using the Increase Time Span and Decrease Time Span buttons on the toolbar (or by selecting Increase Time Span and Decrease Time Span from the Time Scale options under the Chart menu). The time span combo box drop-down list provides a defined set of options (ranging from 15 minutes to one day) from which you can choose. To set a particular time span not available on this list, define a time span using the Time Scale tab in the Configure Chart dialog.
To adjust the graph time span