MS Project 2013 auto schedule duration

Posted on 2014-12-22
Last Modified: 2014-12-22
I am a bit confused on how MS Project calculates the duration for the auto schedule for a summary task. Attached is the snapshot of my tasks. For the summary task, it summarizes as 20.38 days from 1/19 to 2/16. But the duration for all the tasks adds up to 16 hrs. I was expecting 2 days or 16 hrs for the duration for the summary task.
Question by:leblanc
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
LVL 49

Accepted Solution

PortletPaul earned 500 total points
ID: 40513811
DURATION is the measurement, in calendar units, between a start point and a completion point, but MSP (and most PM software) ignore non-work days when calculating duration.

So, if something starts January 19, and completes on February 16

Then "elapsed duration" is the days
 19, 20, 21, 22, 23, 24, 25, 26, 27, 28 29, 30 , 31
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16
3 hours

for "duration" remove Saturdays/Sundays and then
 19, 20, 21, 22, 23,   26, 27, 28 29, 30
   2, 3, 4, 5, 6,   9, 10, 11, 12, 13
3 hours
= 20.38 Days

For example, let's say we had  3 tasks, each takes 1 hour. They ALL can be conducted in parallel.
|---------| task 1
|---------| task 2
|---------| task 3

A summary of those tasks is  1 hour
|---------| summary
|---------| task 1
|---------| task 2
|---------| task 3

IF those tasks cannot be done in parallel then the summary duration is much larger:
|-----------------------------| summary
|---------| task 1
          |---------| task 2
                    |---------| task 3

Open in new window

You CANNOT simply add durations to arrive at the duration of a summary task, you MUST consider the span between start and end.
LVL 49

Assisted Solution

PortletPaul earned 500 total points
ID: 40513873

Featured Post

Increase Agility with Enabled Toolchains

Connect your existing build, deployment, management, monitoring, and collaboration platforms. From Puppet to Chef, HipChat to Slack, ServiceNow to JIRA, Splunk to New Relic and beyond, hand off data between systems to engage the right people.

Connect with xMatters.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Healthcare organizations in the United States must adhere to the guidance of both the HIPAA (Health Insurance Portability and Accountability Act) and HITECH (Health Information Technology for Economic and Clinical Health Act) for securing and protec…
The advancement in technology has been a great source of betterment and empowerment for the human race, Nevertheless, this is not to say that technology doesn’t have any problems. We are bombarded with constant distractions, whether as an overload o…
The viewer will learn how to successfully create a multiboot device using the SARDU utility on Windows 7. Start the SARDU utility: Change the image directory to wherever you store your ISOs, this will prevent you from having 2 copies of an ISO wit…
In this brief tutorial Pawel from AdRem Software explains how you can quickly find out which services are running on your network, or what are the IP addresses of servers responsible for each service. Software used is freeware NetCrunch Tools (https…

717 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question