How to extend and repeat a certain part of an animated layer?

What did you end up doing for this effect, devanramji?

Thanks,
Kevin

Without seeing the modified properties of at least some of the layers you want to modify it's pretty hard to make a reasonable suggestion that points you to an efficient solution to your problem. Just showing us the video is not all that helpful.

I'm assuming that each of the individual elements that spin are on a separate layer and, because of the awkward nature of most of the movement there are just a bunch of position and rotation keyframes with possibly some animated anchor points thrown in. If that is the case you'll just have to extend the layers individually, grab the keyframes where the elements move to the brain and drag them to the right, then either copy and paste or option drag groups of keyframes to change the duration.

If it were my project I would set up a null to do the rotation and position changes, parent each of the element layers to the null, animate their position from the null and then I'd basically only have a couple of sets of keyframes to deal with. The other option would be to use some follow the leader expressions applied to each layer. Then it would be easy to clean up the animation, apply some of the 12 principals of animation like "anticipation" or "squash and stretch" to improve the story you're trying to tell.

FYI, this: The illusion of life on Vimeo is a good overview of the principals of animation that you should try and use in all of your motion graphics. There is a lot of information out there and a great book on the subject (The Illusion of Life: Disney Animation) that every motion designer should read. Ollie and Frank were masters at it and you should invest in their book.