J'ai une vidéo de 8 seconde, j'aimerais que la durée soit de 3 minutes.

​@Oh.N8 has mentioned some options. If you on the iPhone, Adobe has a new mobile app - Adobe Premiere on iPhone
https://www.adobe.com/products/premiere/app.html

I’m on Android so haven’t used the above app. The Android add is supposedly under development.

If you are doing high-end video work, Premiere Pro is and sophisticated video editing tool.Has more in it that the other tools mentioned in this discussion but is a lot more powerful if needed.
https://www.adobe.com/au/products/premiere.html

Hey ​@Luyengo Florian 

You can link a series of short videos in Adobe Express
Adobe Express
 

Firefly Studio is great for linking videos together

Cheers

Nate