You need to calculate that yourself... It'd be awesome to have something similar timeline as AfterEffect or Premiere, but Flash isn't there yet...
You can set the frame rate yourself... Let's say you want to set it to 30 frams per second...
You want to have 30 seconds movie which equals 30 x 30 = 900 frames...
So, just make a keyframe at frame 900 and make that frame your last frame...
It won't be easy thing if you'd want to change the frame rate(speed of your animation) later on, so you've got to find a good number from the starting point and stick to it... ;)
CyanBlue
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by: pepsichrisPosted on 2009-02-11 at 09:45:58ID: 23613877
Can you give us a little more details please - the FLA would be best, but if not, then just a few more details would be useful, eg is it a video you're showing that you want to cut off after 30 seconds?
You'll be doing it via code, btw - the frames/framerate are only a guide.