Estimate Activity Durations is the process of estimating the number of work periods needed to

complete individual activities with estimated resources.

The key benefit of this process is that it provides the amount of time each activity will take to complete.

This process is performed throughout the project.

The inputs, tools and techniques, and outputs of this process are depicted in Figure 6.12.

Figure 6.13 depicts the data flow diagram of the process. 

Estimating activity durations uses information from the scope of work, required resource types or skill levels,

estimated resource quantities, and resource calendars.

Other factors that may influence the duration estimates include constraints imposed on the duration,

effort involved, or type of resources

(e.g., fixed duration, fixed effort or work, fixed number of resources),

as well as the schedule network analysis technique used.