Time

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Across
  1. 2. Continuously, 24 hours a day
  2. 4. Very rarely
  3. 6. Over a brief period of time
  4. 8. At consistent, scheduled intervals.
Down
  1. 1. Over a long period of time
  2. 3. Very early in the morning
  3. 5. Time passes very quickly
  4. 7. Very quickly; almost immediately