Editing the timings in a templated Comp

I have a templated comp that I've used which is 15s long and i've extended it to 20s.

There are images/video sections to the comp with transitions etc and I want to extend them all to be 5s each being the same lengh in time.

Video 3 is too short and the logo outro is too long.

How can i change this so that all 4 sections are 5s long each?