Extend Segments of Clips by a Multiple in Animation

[573837]

I want to know if I am able to extend the duration of my animation clips by a multiple of a number. For example, I want to extend my clips by double its original time, so if one clip is 3 seconds long I want it to become 6 seconds, and if another clip is 2 seconds long, I want it to become 4 seconds. I want to know if there is an easy way of going about this without having to manually extend for each clip