While this course claims that the average attention span is 15 to 18 minutes, I have some different information to offer. In another life, I was an executive at Presentation Technologies in Sunnyvale, Calif. We manufactured film recorders (in the days before LCD and DLP projectors) and participated actively in the corporate presentation world. Our research, developed from our own research and input from Psychologists and Anthropologists indicated the average adult attention span per topic in a lecture situation was in the 8 to 15 second range. POINT: make your point quick. The human mind is full of a considerable amount of other things, boy and girl friends, problems at home, problems at work, financial problems, etc etc.