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Note: if you want to change the timeframe for everyone, go to the settings of the assignment. If you want to reset an individual's assignment drill down into that student and hit the blue 'reset time' key–this will impact only the indicated student.
Looking for Quest's webcam proctoring? Please get on our backup server (replacing 'quest' in the URL with 'lbtest') for that functionality to present–more info here on setting that up.