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Another practical aspect of 4/17 is that a person printing them out can tell if they've got them all (pages go astray).

I do this for business presentations, but especially at conferences to give attendees hope. It includes a progress bar.

Please tell me you also do the classic Microsoft progress bar... 0/100 50/100 95/100 97/100 98/100 99/100 99.5/100

Windows progress bars can occasionally go backwards too <evil laughs>

This also helps the speaker know whether to speed up or slow down to fill their time.