The period of time over which a task takes place, in contrast to effort, which is the amount of labor hours a task requires. Duration establishes the schedule for a project. Effort establishes the labor costs. Each task in a project has a duration, usually specified in work days or portions of work days, that may or may not be different than the amount of effort (or labor) required to complete the task.

(http://www.spiremedia.com/spire.spm?cid=13)

Other Definitions

Duration – The calendar time it takes to create a deliverable. (Wideman Comparative Glossary of Common Project Management Terms v2.1)

Duration -The Amount of elapsed time an activity is estimated to take. (Critical Chain Project Management
by Lawrence P. Leach
)

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 Paradigm-360.com, 360 Difference Mac4Construction.com,iOS4Construction.com and now TheBuildingAndRemodelingWiki.com too.
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