"Adverbs of duration is used to say that an event or situation is continuing, stopping, or is not happening at the moment."

Adverbs of duration show us the length of the action or state.

Adverbs of duration tell us how long something happened. (The test questions are How long? or since when? or up to what?).

» The test question 'How long?' : I am here in Mumbai till Sunday.

» The test question 'Since when?' : I came here to Mumbai last night.

» The test question 'Up to what?' : True friendship lasts forever.