Hardie plank siding is a premium brand of cement board siding (also known as fiber cement board siding) produced by the James Hardie Company.ardie plank can be purchased with a wood-grain look, a plain smooth look or a stucco type finish. Hardie plank also comes in simulated cedar shingle planks.
activity duration. Period (hours, days, weeks) required to complete an activity. Activities with zero duration are called milestones.
Freebase(0.00 / 0 votes)Rate this definition: Duration. In music duration is an amount of time or a particular time interval. It is the length of a note. A duration is a property of a note that becomes one of the bases of rhythm. A tone may be sustained for varying lengths of time.