A court of appeals' plenary power over its judgment expires:
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(a) 60 days after judgment if no timely filed motion for rehearing or en banc reconsideration, or timely filed motion to extend time to file such a motion, is then pending; or
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(b) 30 days after the court overrules all timely filed motions for rehearing or en banc reconsideration, and all timely filed motions to extend time to file such a motion.