I see that some YouTube users have quite lengthy videos. But if I ever try to upload a video of length more than 15 min, YouTube stops me. How can I get more privileges in YouTube?
You can't without becoming a partner.
If you want to upload videos longer than 15 minutes, try another site such as Vimeo, Blip.tv or Viddler. You could also host it yourself using JWPlayer and a CDN such as CloudFront. As Even Mien said in the comments, you could also see if you can become a partner.
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You can upload videos longer than 15 minutes, but you would need to verify yourself using either a voice call from Google or an SMS from them with a verification code.
From their support page: