In Columbia, Missouri, our local independent movie theater group, the Ragtag, hosts (free to all attendees) a series of talks from a wide range of local people -- constraining them to show 20 slides, each for 20 seconds. Hence, "20/20". Obviously, the fast pace is a challenge for the speakers, but a guarantee for the audience that no presentation will last more than 7 minutes.
The youtube link, below, is to my son Tom's sub-7 minute presentation. Tom came to local attention as he reduced his electrical consumption, over a number of years, by 90%, solely by conservation. How? Tom keeps no secrets.
Why the bass solo? Tom elected to eliminate one of his slides.