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24 hours a day
One day is 24 hours, half of that is 12 hours.
12 hours*21 days=252 hours
1 day = 24 hours so 0.75 day = 0.75*24 = 18 hours!
This depends on the type of plant and its specific needs. Plants that require full sun will need minimally six hours of sun per day. Plants that require partial sun will need 4-6 hours of sun per day. Plants that require partial shade will need 2-4 hours of sun per day, and plants that require full shade will need no direct sunlight or no more than 2 hours per day.
Yes.
Habaneros and other nightshades (tomatoes, peppers, eggplants, and potatoes) are sun- and- heat-loving plants that need a minimum of 5-6 hours of strong sun per day to flower and set fruit. 8-10 hours is even better.
about 4 hours a day or 5 hours a day
There are 24 hours in a day, no need for a decimal.
You need 5 hours or exercise a day
Poinsettias and chrysanthemums are short day plants. They need a certain number of hours of uninterrupted darkness to cause the plant to start flowering. Poinsettias need 18 hours of darkness to trigger this. Chrysanthemums need twelve hours of darkness.
6 Hours of sleep is enough
8 hours.
You need to specify the latitude or city.
Iris need full sun, at least six hours a day.
The human body need a totall of 9 hours of sleep during the day or night to function correctly the next day.