Why wont after effects render my whole movie ?

I got a simple comp in after effects. Its just some text and a picture noe videos.  But i do got some effects, on the text and the picture im using :

Twitch in the twitch effect manuel , i am using "Bad disortion"

And im using the wiggler, in the mid of the clip.

On the text i am also using twitch. I suppose is the same , which effect it is on the text. Cause it just a effect for a really short time.

So the whole project movie its about 48 sec long. But when i render it to mov , it just renders 3 second. So i can only watch 3 seconds of my mov.

Computer specs :

Macbook pro Retina 15.

Processor : 2,3 GHz Intel Core i7

Memory : 8GB 1600Mhz DDR3

Graphics : Nvidia GeForce GT650M 1024mb

Software : OS X 10.8.3