Custom time-range (Last X days)

[buerviper]

Is your feature request related to a problem? Please describe. I can set my statistics to pre-defined time-ranges (all days, last 7 days, last 30 days, since a specific day, or a specific range in the past).

Describe the solution you'd like I would like to set also a custom time-range (like past 60 days) instead of setting a reference day in the past.

Describe alternatives you've considered I could change the reference day every other week, but this seems like unnecessary work.