It's quite strange that the erase is taking so long, actually. We simply call disk utility to perform this function, and I don't know why it'd take 30 seconds.
Can I ask you to send your SuperDuper!.log and a System Profiler report (start System Profiler, choose File | Save and save to the default [XML] format) to support via email? Let's see if there's anything in there that might help to explain your unusual situation.
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--Dave Nanian
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