Guy promotes the 10/20/30 Rule of PowerPoint.
- have ten slides
- last no more than twenty minutes
- contain no font smaller than thirty points,
Ten is the optimal number of slides because a normal human being cannot comprehend more than ten concepts in a meeting.
If you have an hour scheduled, give your ten slides in twenty minutes which allows time in case people arrive late or have to leave early. If all goes perfect you will have plenty of time for discussion.
Force yourself to use no font smaller than thirty points. It will make your presentations better because it requires you to find the most salient points and to know how to explain them well.
Aspire Communications Relational Presentations