It's a pity you cannot use a number for them to call that costs them £10 per minute and which hangs up after nine minutes. That's eight minutes and 40 seconds of preamble before they can leave a message in the last 20 seconds, which will almost fore them to call again to continue the message.
Or just have it hanging up after 25 minutes of "hold music" - badly off-key Greensleeves is quite annoying, but off-key and repeated snatches of any tune could eventually send the listener insane.
Possible hold music:
The advantage of this is that it is quite pleasant and may be sufficiently memorable for the caller to Google the first line after the call has ended.
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