Durations do not add up

[AdamTJ]

I am having a problem getting accurate durations to display in Microsoft Project 2003.

Basically what I have is a bunch of tasks that need to be completed in succession. (It is checkout of many instruments). The average time to check these out is 15 minutes an instrument. (I have added two resources so that the duration should be 7.5 minutes an instrument).

When the tasks are rolled up the duration shows around 4.5 days to complete this task. (we have a 12 hour / 7 day calendar assigned). The problem comes into play when you look at the dates in the "start" and "finish" columns. That shows 9 days being used.

I have been struggling for the past couple of days trying to get the durations correct, but have had NO success. Anyone have any ideas?

 

[PDQBach]

give three examples showing start, finish, MSProj Duration, what you think the duration should be.

What version?

 

[AdamTJ]

This is in project 2003, BUT, I have both 2007 and 2003. This has caused issues before (changing back and forth between versions), but others are having the same problem and are only running 2003.

Existing Prep 1.54 days 0% 6/2/2008 8:00 6/5/2008 8:53
Motors 0.84 days 0% 6/2/2008 8:00 6/3/2008 17:15
Check Out 0.84 days 0% 6/2/2008 8:00 6/3/2008 17:15
Devices 0.69 days 0% 6/3/2008 17:15 6/5/2008 8:53
Checkout 0.69 days 0% 6/3/2008 17:15 6/5/2008 8:53
New Prep 2.83 days 0% 6/5/2008 8:53 6/10/2008 17:53
Motors 0.92 days 0% 6/5/2008 8:53 6/6/2008 19:53
Checkout 0.46 days 0% 6/5/2008 8:53 6/6/2008 7:53
Commisioning 0.46 days 0% 6/6/2008 7:53 6/6/2008 19:53
Devices 1.67 days 0% 6/6/2008 19:53 6/10/2008 10:53
Checkout 0.83 days 0% 6/6/2008 19:53 6/8/2008 15:53
Commisioning 0.83 days 0% 6/8/2008 15:53 6/10/2008 10:53
Valves 0.25 days 0% 6/10/2008 10:53 6/10/2008 17:53
Air Line 0.08 days 0% 6/10/2008 10:53 6/10/2008 13:53
Checkout 0.08 days 0% 6/10/2008 13:53 6/10/2008 15:53
Commissioning 0.08 days 0% 6/10/2008 15:53 6/10/2008 17:53

I think that the durations should all be double what they are currently showing. I am not sure if you can make sence of what I pasted in here. (Task Name, Duration, % Complete, Start, Finish)

 

[PDQBach]

Duration is a derived field so Project's calculations during an import override what you've provided.

Please send a copy of the plan to PDQBACH4100 at H0tma1l - thanks.

 

[PDQBach]

Still waiting for a sanitized copy of your schedule at H0tmail.