How long is the time duration?

How long is the time duration is a question asking for length of time something lasts, and answer depends on what duration you refer to, as duration is simply measure of elapsed time from start to finish. Time duration can be any length, from fractions of second to billions of years, depending on event. For example, duration of a typical movie is about 2 hours, duration of a work day is 8 hours, duration of a week is 7 days, duration of a month is 30 days, duration of a year is 365 days. In roofing, duration of Owens Corning Duration shingle warranty is limited lifetime with 10 years non-prorated, while actual lifespan duration is 25 to 30 years. In finance, duration of bond might be 5 years. In project management, time duration of construction project might be 6 months. To determine how long time duration is, you calculate end time minus start time. If event starts at 9 AM and ends at 5 PM, duration is 8 hours. If project starts January 1 and ends December 31, duration is 12 months or 1 year. Duration can be expressed in seconds, minutes, hours, days, weeks, months, years. So question how long is time duration is open-ended, duration itself is answer to how long. You need specific context to give exact duration length. Time duration is length of time interval.