Off the People tab, click on the 'Chart's tab to view.
It is possible to enter a new date range in the popup field. Note that the longer the range backwards, the longer it takes for the chart to show up. This popup governs all records. You may want to set it at a low value just for speed of viewing.
The field is set to auto update when you make the change, so clicking on 60 will update the chart to the past 60 days.