At least according to my DVR, which has it running 15 minutes over. That's probably an estimate.
In related hagiography news, the CNN doc on Colbert - The Last Laugh - is neither must watch nor horrible. Which seems consistent with their other documentary output. The talking heads were mostly EPs from the Report and former Second City performers who were there when Stephen was. Those periods of Stephen's career were the strongest parts of the doc.
Best,
David