This article was previously published under Q87301
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Tasks with elapsed durations, rather than working durations, may introduceslack into a project because these tasks can extend into nonworkingportions of the project calendar.
Setting an elapsed duration on a task (for example, "1ed" as opposed to"1d") fixes the duration of the task in an absolute sense. An elapsedduration allows Project to extend the task into nonworking portions of theproject calendar. A "4eh" (4 elapsed hours) task that began at 2pm, forexample, would finish at 6pm without regard to the project calendar. Thismay result an unexpected amount of slack for some tasks.
NOTE: For this example, use the Standard project calendar.
Create two tasks; task 1 with a duration of 8h, and task 2 with a duration of 9eh.
Create a third task, task 3, with a duration of 1d.
Set the project start date to 7/24/92 8am. Project 2010: On the Project tab, click Project Information. Project 98-2007: On the Project menu, click Project Information.
Project 4.1 On the File menu, click Project Info.
Project 4.0: On the File menu, click Summary Info.
Make tasks 1 and 2 predecessors (FS) of task 3.
In this example, both tasks 1 and 2 start on 7/24 8am, and finish on 7/245pm; yet the Total Slack for task 1 is 0d, while the Total Slack for task 2is 2.63ed.
Because task 1 has a working duration of 8h, no portion of that task can bescheduled between 7/24 5pm (Friday) and 7/27 8am (Monday); hence, it has noslack.
However, task 2 has an elapsed duration of 9eh, and so could be scheduledto start as late as 7/28 11pm (Sunday) and still not delay task 3. TheTotal Slack is the difference between 8am Friday and 11pm Sunday, 2.63ed(63h).
Note that elapsed duration tasks are scheduled to start just as any othertask; that is, they are scheduled to start only during calendar workinghours. The elapsed duration implies only that the task can extend intononworking hours once having started. For task 2 to start between 5pmFriday and 8am Monday, it would have to be forced with either a Constraintor an Actual Start/Finish date.
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