Estimated task duration = (B+4P+W)/6
A project manager estimates task length using a weighted formula (B+4P+W/6) For instance, a project manager might say that converting files could be done in 20 days, could take 34 days, but would probably take 24 days. (20+ (4*24) +34)/6=25.
Estimating how long something will take on a project is a game of riddles. There are three considerations to keep in mind as you tackle this project management process. Estimating how long anything will take is difficult for most of us.
Rather of taking the time necessary to complete a work, we often stick to the time frame specified by our management. Delays in a project's timeline are to be expected and planned for. The best you can do when trying to estimate how long a task will take is to account for as many variables as possible and use that information to arrive at a timeframe within which you can be reasonably confident that the task will be completed.
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