This is the 1824th most frequent Japanese word.
延長
Extension or prolongation.
延長 is used in the context of entering overtime in a sports match.
試合に延長戦が入りました。
The match went into overtime.
延長 is used to indicate the act of extending the duration of the meeting.
会議の時間を延長しました。
The meeting time was extended.
延長 is used to describe the physical extension of the railway (its track).