Start time and duration together define when an event begins and how long it lasts, commonly used in scheduling, project management, calendars, and media. Start time means the specific moment or clock time when event, task, or activity begins, for example meeting start time is 9 AM, movie start time is 7 PM, project start time is January 1. Duration means length of time event lasts from start to finish, measured in units like minutes, hours, days, months, or years, for example movie duration is 2 hours, project duration is 3 months, work shift duration is 8 hours. When you have start time and duration, you can calculate end time by adding duration to start time, so if start time is 9 AM and duration is 2 hours, end time is 11 AM. In construction scheduling with software like Sage Timberline, start time and duration are used to create Gantt charts showing when tasks begin and how long they take. In roofing, job start time might be 7 AM and duration 3 days for installing Owens Corning Duration shingles. In calendar apps, you set start time and duration for appointments. Start time answers when, duration answers how long. Together they define time interval. For example, conference call start time 2 PM, duration 1 hour, means call from 2 PM to 3 PM. So start time and duration mean beginning moment plus length.
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