6.7B10. Physical description
If the individual works in a collection are identified in the title and statement of responsibility area, list the durations of the works in a note. If the individual works are listed in a contents note (6.7B18), give their durations there.
When recording individual durations in the note area, give them as they appear on the item (e.g., in minutes and second if so stated). If only the durations of the parts of a work are stated (e.g., the movements of a sonata), add the stated durations together, if desired, and record the total for the work in minutes, rounding off to the next minute.
Precede a statement of duration by "ca." only if the statement is given on the item in terms of approximation. Do not add "ca." to a duration arrived at by adding partial durations or by rounding off seconds.
If the duration of a work is not stated on the item or if the durations of some but not all are stated, do not give a statement of duration for that work. Do not approximate durations from the number of sides of a disc, type of cassette, etc.
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