The most common thing I do when adjusting Time Range under Monitors or Reports is the following:
Select "Set Specific Dates"
Start Date: 1st day of the previous month, 00:00
End date: Last day of the previous month, 23:59
...because I'm doing monthly reporting. It would save me several clicks every month if one of the Time Range choices was simply "Last Calendar Month", because "past month" won't give me quite what I need.
Just a thought...