The claim to a speedy trial in NC is based on the Constitution (US), and they don't have a statute (spelling out the details).
Anyway, have any of the accused been demanding early prosecution, or what?
I don't know if they have or not, but apparently they can't because of the established case management process which presumes time is waived. The defense would probably have to file a special motion to do it and that hasn't happened as far as we know.