The reported time is the elapsed time from starting of the command to completion of the command. - This elapsed time may not necessarily the processing time for the command. + This elapsed time may not necessarily be just the processing time for the command. + It may included interrupt level processing, for example. In a busy system, command processing could be delayed if pre-empted by other, higher priority threads competing for CPU time. So the reported time includes all CPU processing from the start of the command to its finish possibly including unrelated processing time during that interval.