• 1. Every 8 hours: 每8小时一次
• 2. Once every 8 hours: 每8小时一次

• 1.Rules for the couch potato honor, as stipulated by Guinness, allow for a 5-minute break every hour and a 15-minute break every 8 hours.
  每8小时可以休息15分钟。除此之外，他就必须目不转睛的盯着电视屏幕了。
  dict.yoduao.com
• 2.Middle school students should have at least 8 hours' sleep every day.
  中学生每天至少应该保证8小时的睡眠时间。
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• 3.Most students have less than 8 hours of sleep every night.
  大多数学生每晚睡眠不足8小时。
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