The word "duration" indicates the time period over which an event occurs, or the amount of time an object, structure or situation exists (i.e. the duration of a war, or of a pyramid). In music,...
the court decided that slave owners should be allowed to reclaim their slaves this was in the favor of calhoun.
Adverbs of Duration tells how long the action has being done
All your life until someone finds a cure for it which has not been discovered yet.
basic continuance or persistence in time