Questions about the rules. (CLOSED)

Is it possible to make a longer animation, like about 30 second long ?

yes, you have to use a video editor.

The official rules state: "Animation ***should*** be short - approximately 10 to 20 seconds".

So, a longer animation would be acceptable. 

There is a thread for contest questions right here: 
https://www.renderhub.com/forum/4641/vision-of-the-future-two-new-contests

I'll be closing this thread as answered. 

Wait only up to 20 seconds?