Roughly a third.
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If he sleeps 8 hours in a 24 hour day, than 8/24 = 1/3. Even if you multiply that by 7 days in a week, it's still 1/3.
Between seven and eight on average.
75 minutes is 1.25 hours.
95/100
I have read that the average person sleeps 25 years in their lifetime.