Step 3: Calculate the Duration of Each Path
To do this, you can simply add the duration of each activity in each path. For Path 1, you get:
Duration for Path 1 = Duration of Start + Duration of Purchase Plot + Duration of Select Design + Duration of Purchase Wood + Duration of Assemble Shed + Duration of End
Now, plug in the numbers and you get:
Duration of Path 1 = 0 days + 5 days + 3 days + 3 days + 8 days + 0 days = 19 days
Note: The duration of Start and End is zero because there aren’t activities, rather they are events.
Similarly, you can calculate the duration of the other paths:
Duration of Path 2 = 0 days + 5 days + 3 days + 1 days + 8 days + 0 days = 17 days
Duration of Path 3 = 0 days + 5 days + 3 days + 4 days + 4 days + 6 days + 8 days + 8 days + 0 days = 38 days
The durations calculated assume that there is no scope creep. In real projects, scope creep can be expected. However, it is up to the project manager to control the degree of scope creep. Read the Managing Scope Creep article for more about controlling and monitoring scope creep.
Each path has a different duration. That means the Critical Path Method or the Critical Path Analysis is required to determine the most important path. As a project manager, you will need to keep an eye on the Critical Path.