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Possible Duplicate:
Writing less than 15 characters in a comment triggers the 30 second protection.

If you you attempt to add a comment, and the comment fails to add (for instance, if it is less than 15 chars); then the system doesn't let you from resubmit (after fixing the fault, of course) for 30 seconds.

marked as duplicate by random, Jeff Atwood Oct 22 '09 at 8:24

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