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one every 4 to 6 hours. It's usually use in prescribing medication... (ravin21)
Sleeping
It means any length of time that is both not less than 4 hours and not more than 6 hours.
12 degrees colder
No. There are 60 minutes in one hour, so 0.2 hours = (0.2 x 60) = 12 minutes. 6.2 hours means 6 hours and 12 minutes. 6 hours and 15 minutes is the same as 6.25 hours.