There isn't a length requirement or minimum, and both of the options Liz presented are valid approaches to this contest. Do whichever you think is most effective with your ideas or how many things you'd like to present.
That said, I can't think of an effective way to show off your favorite stuff about Graal in less than 30 seconds. If someone thinks they can prove me wrong, go for it!
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lol. i was thinking of an ad like that can be presented on iTunes/Google Play stores.. hmm idunno now ur saying that