When viewing a report, you are always viewing an accumulation of data over a certain time frame. This time frame is displayed in the form of a small calendar on the left side of the window.
You can use this calendar to change the time range you are currently viewing.
Each time you change the time frame, the statistics will be calculated for that time frame. Since the statistics are cached in a file containing all of the results, if you navigate to the same time frame of the same report later on, the result will appear instantly.
The currently selected time frame is highlighted in yellow on the calendar.
If the time frame you are currently viewing overlaps the current time of day, and you are viewing the report on the same server that is serving the Watson Explorer Engine software to your end-users, the results you are viewing may change as users perform queries and more data is entered into the reporting database.