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.
Duration is defined as the total number of calendar days that it takes to complete a task. For example, if the same two people spend 10 total hours working on a task that they start on Monday and end on Friday, then the total duration for that task is 5 days.