24hours is the minimum time the product has to run in order to show up some meaningful data;
still there are views and reports on the planning side which average on a weekly basis. In general those periods are controllable (to some extent) in the policies configuration.
As to this specific report, I think there isn't a graph in but a table, should be at the last pages of the report (after all system parameters and settings are listed).
On your snapshot, seems to me you're showing the second page of the PDF which is just blank on all reports, there's nothing supposed to be there.