Final answer:
A Sprint is over when the time-box expires.
Step-by-step explanation:
A Sprint is over when the time-box expires. In Scrum, a time-boxed iteration is called a Sprint. The length of a Sprint is typically between one to four weeks and is determined by the Scrum Team. At the end of the time-box, the Sprint is considered over, regardless of the completion status of the Sprint Backlog.