You seriuously need to read up on how AE works. This is basic stuff. Composition --> Composition Settings.
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Your comp is 30 seconds long. Change it in the comp settings to the duration you wish.
And no, the comp should NOT automatically update. AE is not a video editing application. You're not in Kansas any more.
To learn the many, many differences between an an effects, motion graphics and compositing application (AE) and your video editing application, I recommend spending some quality time here:
Thankyou so much sorry im newish to After effects and i cant really watch tutorials on anything without constent buffering as my internet is so slow
> i cant really watch tutorials on anything without constent buffering as my internet is so slow
The Help and getting-started resources that Dave pointed you to include many text resources, including books, plus at least one DVD set that you can order to watch locally. A slow Internet connection is not a blockage to you learning the basics.