You could probably do it with a SCORM, but it will depend on what program is used to build the SCORM. Off hand I know with Adobe Captivate you can store the system time to a user variable at the start of the lesson, grab it again at the end of the lesson, and have it compute the difference. There may also simply be a way to add a timer that runs throughout the lesson's activity. But as I said, it will depend on what you use to build the SCORM.
General help
time on task
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