The 10/20/30 Rule of PowerPoint - Guy Kawasaki

the 10/20/30 Rule of PowerPoint. It’s quite simple: a PowerPoint presentation should have ten slides, last no more than twenty minutes, and contain no font smaller than thirty points.

The ten topics that a venture capitalist cares about are:

Problem
Your solution
Business model
Underlying magic/technology
Marketing and sales
Competition
Team
Projections and milestones
Status and timeline
Summary and call to action

You should give your ten slides in twenty minutes.