the story climax is forced by a time limit
If not for the story being forced to a climax, it might continue forever. When a story is brought to a conclusion because the characters run out of time, it is said to contain a Timelock. As an analogy, a story might be thought of as the effort to find the solution to the story's problem which is hidden in one of the rooms of a mansion. Each room contains a clue to the actual location of the solution. The Main Character is told he may search as many rooms as he likes in five minutes. At the end of five minutes he is given a choice. Based on the clues he has already found, he must decide if the solution is in one of the rooms he already searched or in one of the rooms he has not yet searched. Either choice may lead to success or failure, but because running out of time forced the choice it is a Timelock story. The choice represents the Timelock which brings the story to a close and forces such appreciations as Main Character Resolve (Change or Steadfast), Outcome (Success or Failure), and Judgment (Good or Bad).