15-18 hours a day.
8-15 hours a day
There are 24 hours in a full day, so 15 hours is less than a day- 15/24 or 5/8 of a day, in fact- somewhat more than half a day.
Sloths sleep 15-18 hours per day.
15 hours
they get 15 hours of sleep
about 1 day 15 hours
you have to work 15 hours per day
2:15 14:15 if one is in other half of day
39 hours (1 day 15 hours).
15 days x 24 hrs per day = 360 hrs.
Five eights of a day (5/8) or 0.625 of a day.