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# Conversion of Manhours into Durations

Dear Sirs / Fellows,

Please let me know that how Manhours will be transformed into duration of activities?

I have set of activities having manhours per unit basis. e.g.

For Example:

**Armoured Cable #14, 2 Conductor, Solid Copper **

Unit of Time: "**Hours**";

Unit of Qty "**Meter**";

Manhour Factor: **0.09**

If BOQ Quantity of Cable is 3000 Meter, So using this Manhour Factor, How could i Calculate the Estimated Duration of Cable Laying?

Responses are awaited.

Hi Muhammad

The tools & techniques to calculate the duration of each activity is very well explained on this website. The link is displayed below.

Here you learn the different techniques such as analog, parametric and bottom-up estimating to find the quantitative assessment, effort, and duration.

It is better to learn the fundamentals then had-hock advise

Regards Johannes

http://www.planningplanet.com/guild/gpccar/calculate-the-duration-of-eac...

Anoon Thanks for your reply, exactly what i want the answer. but the confusion is that, **0.09** manhour would be hours/unit or unit/hours? means we have to multiply it with the total quantity as you did or have to divide with it?

if 0.09 manhour is Unit/Hour productivity then have to divide to get the duration...

Similarly, another example is

Buried Steel Duct 100x600 (4"x 24")

Unit of Time: "**Hours**";

Unit of Qty "**Meter**";

Manhour Factor: **2.16**

If BOQ Quantity of Steel Duct is **800 Meter**, So what would be the correct Answer? **Number 1 or Number 2 **???

**Number 1:**

800 x 2.16 = 1728 Hours = 1728/10 (Working Hours) = 172.8 Days further Divided by Size of Crew to get the estimated duration.

**Number 2:**

800 / 2.16 = 370.3 Hours = 370.3/10 (Working Hours) = 37 Days further Divided by Size of Crew to get the estimated duration.

Kindly, Help me out to understand how can i use standard manhours (Productivity) to calculate the activity durations?

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