The System Utilization Report provides a graphical display of your center's used versus available time. In essence, this Report shows how busy your center was over a selected date range. It can be customized and limited in a variety of ways, allowing you to produce an overview of your utilized time in the way that is most meaningful to your center.
The System Utilization Report is accessed via Report: System Utilization. That option is available under the "System Utilities & Reports" section of the Welcome menu, and is typically available to full administrators only. Once you access the Report, you will find options for configuring the way that it calculates "used" time, as well as other limits on the Report's display.