1. Duration is the total time taken to complete an activity from
start to finish.
ProcessTime represents the actual work time.
ProcessTime of aninclude
The ProcessTime ‘clock’includeactual work amiddle ofsits in activity.
Consider the activitywhen starts whentimestarts. Duration an ‘Inbox’.
This Durationbeginsactivitythe when thean item is complete. represents
Duration may also stops waiting inRequest”.
“Managerdelays review arrives thethe
Review the request at review due
to external demand order arrives at an like phone the Time
For total elapsed time for the Manager operator’s desk, or an spent
the example: a workfor Manager time…to completecalls.review.
The Duration ‘clock’ machinist’s workstation.
addressing interruptions would the item leaves the activity.
assembly arrives at astops whennot be included in the ProcessTime.
includes the ProcessTime.
Duration includes all the time an item is waiting, delayed, and being
In this example, activity.
worked on at an the ‘clock’ starts when the request is submitted to the
Manager for review.

2. ProcessTime represents the work time.
Consider the activity “Manager Review Request”.
The ‘clock’ stops if the review is interrupted the toto
ProcessTime whennot include the time due
starts does the time actually invested
records onlythe Manager actually begins
ProcessTime represents the actual work time
the review.
complete the the ‘Inbox’.
externalsits inreview. phone calls.
request demands… like
required to complete the review.

3. When there are no delays, the
Duration and ProcessTime are equal.