Activity Duration is the best estimate of the time (hours, days, weeks, months, etc.) necessary for the accomplishment of the work involved in an activity , considering the nature of the work and resources needed for it. (Wideman Comparative Glossary of Common Project Management Terms v2.1)

Other Definitions

Activity Duration – The length of time (hours, days, weeks, months) that it takes to complete an activity . This information is optional in the data entry of an activity .Work flow (predecessor relationships) can be defined before durations are assigned. Activities with zero durations are considered milestones or hammocks. (Wideman Comparative Glossary of Common Project Management Terms v2.1 )

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J. Jerrald Hayes
I am ex-architectural woodworker and general contractor turned IT, Business and Project Management consultant, software developer wannabe senior division triathlete and ski racer, Yankee fan and founder of, 360 Difference, and now too.
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