Presentation Zen has some thoughts on keeping our audiences wanting more:
Japanese have a great expression concerning healthy eating habits: Hara hachi bu. Hara hachi bu means “Eat until 80% full” (literally, stomach 80%). This is excellent advice and it’s pretty easy to follow this principle in Japan as proportions are generally much smaller than in places like the US. Using chopsticks also makes it easier to avoid shoveling food in and encourages a bit of a slower pace.
Here are some ways to implement the idea:
Hara hachi bu is one simple principle that can help you have a much healthier life. It’s also a principle that can be applied to the length of speeches, presentations, and even meetings, etc. My advice is this: no matter how much time you are given, never ever go over time, and in fact finish a bit before your allotted time is up. How long you go will depend on your own unique situation at the time but try to shoot for 80-90% of your allotted time. No one will complain if you finish with a few minutes to spare. The problem with most presentation is that they are too long, not too short. Performers, for example, know that the trick is to leave the stage while the audience still loves you and don’t want you to go, not after they have had enough and are “full” of you.
In Western terms, “Less Is More.”