editing length

I have a 20 second selection that needs to be about 16 seconds long. What is the best way to do this. I have tried the effects tool but haven’t quite gotten the hang of it yet. It is eith too long or too short. Yes, I am also new but I am trying!

Change Speed and Change Tempo will be do that.

You will want the Percent Change = (Original length / Final length) - 1

In your case Percent Change = (20 / 16) - 1 = 25