How to manage logs' preservation period using RollingFlatFileTraceListener on Enterprise Library Logging Application Block?

Question

Enterprise Library(v5.0) Logging Application Block's Rolling Flat File Trace Listener has options to roll over the log files. ( http://msdn.microsoft.com/en-us/library/ff664768(v=pandp.50)#trace_rolling )

They are 'Time' and 'File Size'.

• I can manage log files' whole size by controlling 'Max Archived Files' and 'RollSizeKB'.
• Or, I can manage log files' max preservation period by controlling 'Max Archived Files' and 'RollInterval'.

But, I want to manage both log files' max preservation period and whole size at the same time.

How can I do it? Do I need to make and use my own TraceListener?