We just did this over the web-based bulk operations interface and it took over 2 hours.  That's 2 hours of elapsed listserv processing time.  Would this have been faster with a huge e-mail message?  This isn't something that's done very often, but I'm curious about the best way of doing it in case it happens again.
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Bill Verity - 814-865-4758  Fax: 814-863-7049
Postmaster & Listserv maintainer
Center for Academic Computing, Penn State University
At the office - on my Mac, of course ;-)