Time: Calculating Duration, Start and Finish Times When teaching this concept, look for: • Students who understand that duration is the time between a start and a finish. • Students who can use a number line to represent and solve duration problems. • Students who can find the finish time when given a start and duration. • Students who can calculate the duration when given a start and finish time. • Students who can identify the start time when given a duration and finish time. Loved by teachers