What is the purpose of the Table of Hours in the novel, We?

The Tables of Hours, a system, derived after the Two Hundred Years' War, insures millions of Numbers in the United State awaken, start and finish work, eat (50 chews per bite), walk, exercise, and go to bed at precisely the same minute. The only variation comes twice a day, at 16:00 and 21:00 when personal hours are scheduled.