Participants are not very good at returning from a ten minute break within ten minutes. This presentation is set to automatically count down from 10:00 to 00:00 minutes. The run time is slightly longer than ten minutes due to a limitation in PowerPoint.
When it is time for a break start the presentation click on the fist slide and see if your results improve. It also helps to play music during the break. When the music stops people tend to find their seats.