JOB-TIME is a time-tracking reactor for Autodesk® AutoCAD® (any version), which automatically logs true (net) editing time spent in the current AutoCAD drawing. Idle periods (longer than the defined timeout) are not counted to the tracked time. Time information is stored inside the DWG file (in drawing properties) and logged into a TXT or CSV (Excel) file.
See more information at Job-Time.
Job-Time is a trial version of a commercial utility by CAD Studio - see http://www.cadstudio.cz/jobtime.