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Chris, a 60 sec image with 20 sec gaps means you can only get 75% of the meteors - assuming they occur regularly.
As for the actual shooting, it all depends on how your camera handles long exposures and the noise from them, and how much light pollution you have.
If you have ICNR turned on a 60 sec exposure takes 120 secs. If you turn it off then you can cut down the delay between frames to a couple of seconds - long enough for it to save the image.
Then you'd have to take a series of dark frames equal in length to create a master dark and do dark subtraction.
60 sec exposures here would be totally wiped out by light pollution.
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