The SCORM 2004 specification does not require that the SCO set a value for cmi.session_time. However, the specification states that if the SCO chooses not to provide a default value, the LMS can. Skillport and the RTE provide a wall-clock time (from launch to terminate) for the default cmi.session_time for the SCO if none was specified.
total_time on a Skillport installation, it must explicitly set cmi.session_time to zero before calling Terminate.
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