• Richard Shetron <guest2@sgeinc.com>:

What does this line really mean and why does it take so long to run?

It means that sending the mail to the marchreport_daily_alert_ctc10 list too 168.022 seconds,

Oct 23 06:03:01 2012 (1870) <7.0.1.0.0.20121016133607.0469b148@marchreport.com> smtp to marchreport_daily_alert_ctc10 for 2 recips, completed in 168.022 seconds

A look at your mail server logs and the timestamp data therein should give you a finer-grained look at the timing of SMTP events associated with Mailman's outgoing posts.

It should be easy to find.