Rendered Project Time

I don't seem to be able to set the actual project time to be rendered, I have short projects between six seconds and ten seconds selecting "content area" in Export always results in a 12:22 (12 second 22 frame) rendered project. Is there some secret to setting the real preferred length of the project? If I have an 8 second video as an example I really want an 8 second finished render not 12 seconds. It seems the timeline choices need some work to make this happen.
If there is a setting I am missing someone please point me to it.
Regards,
James

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