Effort Vs. Duration Vs. Elapsed Time: Project Management Series

What is the Effort?

As the name suggests, “effort” is defined as the amount of work, or the number of work units used to complete an activity. In simple terms, the effort is the number of hours workers spend, focused on a particular task, to get a certain job done. If you want to determine the other two, you must first determine the effort in a project. The effort is most often expressed in staff hours, days, or weeks.

Stakeholders often want to know how much a project will cost. This chiefly depends on the measure of time members of the project spend on the project. A simple example to explain this concept follows. Let’s say you begin to paint your house. You work for 6 hours a day for 9 days. Your effort would then be the amount of time you take in a day multiplied by the number of days you work, which would be 54 hours. The effort you put in is 54 hours.

What is Duration?

Duration is defined as the entire time taken to complete an activity, based on the resources allocated to the project. It stretches from when the task first began to the day it ended and does not include time off like holidays or other non-working days. It is also referred to as calendar time.

The duration can be expressed in Work Hours, Work Days, and Work Weeks.

Take the same example given for effort. You begin to paint your living room. You work for 6 hours a day for 3 days. The time duration of your work painting the living room is 3 days.

What is Elapsed Time?

Elapsed time is the time between designating a resource to a task and the completion of the task. In simple terms, it is the passage of calendar days. Elapsed Time includes holidays and weekends. Elapsed time can be traced by milestones that have been set on the schedule of the project.

Consider the first house painting example. You work for 6 hours a day for 9 days. The elapsed time for a normal day’s work maybe 4 hours, which includes 4 hours of real-time work plus breaks and lunchtime. Your Elapsed Time is 11 days, and that includes a Saturday and a Sunday, including the breaks you take in between.

Another example: you work on a construction project for eight days from Monday to the next Wednesday, with a weekend (Saturday and Sunday) in between. Your elapsed time is 10 days since the non-working days are also counted.

In the Project Management Exams

The effort, Duration, and Elapsed Time constitute a small part of the Time Management/Scheduling Module. You may not get questions about these during your own exam, but it is important for you to understand these concepts. 

As a project manager, you should be well-trained in Project Time Management to be able to effectively manage deadlines and other time constraints. Without this skill, the project you are running can head straight down the hill, accumulating increased overheads.

Summary

The table below compares and contrasts the three concepts covered in this article.

Conclusion

If you’re studying for a project management exam like the PMP®, consider online Project Management training from Simplilearn. We offer a wide variety of project management courses designed to help you pass the PMP exam on the first try, taught by certified faculty with at least 10 years of industry experience.

Want a taste of Simplilearn training? Watch our video Introduction to PMP Certification Training.

PMP is a registered mark of the Project Management Institute, Inc.