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Dave,   I've long had a "by guess and by golly" rule that we should try to
have 
every experience come available to a new person every 90 seconds.  So, a 
three minute experience should be twinned, etc.

I arrived at that by timing how long people would wait before they showed 
signs of impatience, or moved on to another exhibit.  It was rather
unscientific;
I did not have a statistical sample.

Like you, I'd be interested to hear what others think of this matter, and
if there 
are good measurements.

Marty, for multimedia exhibits, there are several examples of a request,
after
x minutes or a complete cycle, to let someone else use the exhibit.

Regards,  Peter Anderson

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