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timeboxing

n. (context management English) A way to plan activity by allocating specific time boxes for a task that is used as a distinctive feature in several project management approaches. vb. (present participle of timebox English)

Wikipedia
Timeboxing

In time management, timeboxing allocates a fixed time period, called a time box, to each planned activity. Several project management approaches use timeboxing. It is also used for individual use to address personal tasks in a smaller time frame. It often involves having deliverables and deadlines, which will improve the productivity of the user.