Changing the Time Range
Time range settings apply throughout the entire application (for all instance and dashboard graphs). You can change the time range for a resource's graphs by clicking the Time Range button located at the top right of both the Resource and Dashboard pages' toolbars.
From the Time Range dialog that appears, you can select the default time range, a predefined time range, or a custom range. This will apply to all graphs, and will remain in effect until the user session ends or the time range is changed once again.