Hello Thomas,
Thanks for the inquiry. I would presume you are referencing the User Stats setting under the General settings. I do believe we default that to be 13 months. I do know that the folder should update once you apply the changes. This would then remove the .STAT file for the predefined time or months from reporting the results when selected.
Please let us know if you have any difficulties or if the option is not working properly. Consider opening a Support ticket and we can review this further.
Thank You.