An amount of time or a particular time interval. / (in the singular, not followed by "of") The time taken for the current situation to end, especially the current war

Of or pertaining to duration.

plural of duration

(music) Foreground details, such as rhythmic units or rhythmic gestures, as projected against a background metric structure.

plural of durational pattern

Characteristic of, or relating to, a duration.

Without a duration.