du ‧ ra ‧ tion AC /djʊˈreɪʃ ə n $ dʊ-/ BrE AmE noun [uncountable]
[ Date: 1300-1400 ; Language: Old French ; Origin: Latin durare 'to continue in existence' ]
the length of time that something continues:
The course is of three years’ duration.
for the duration (of something)
The package includes cycle hire for the duration of your holiday.