Cows are not photosensitive like chickens and sheep are, nor are they plants. They will "use" the amount of daylight hours that is given to them, naturally or artificially.
8 hours
A newborn calf needs to have his milk every two to three hours.
Uh, stomachs have NO COWS!
The duration of Buying the Cow is 1.47 hours.
The duration of Poor Cow is 1.68 hours.
The duration of Cow - film - is 1.55 hours.
The duration of The Cow - film - is 1.67 hours.
The duration of Cow Belles is 1.47 hours.
If the cattle were raised on pasture, in a 24 hour period, they can graze around 18 to 20 hours a day.
They need to eat 2 square yards.
Cows, like humans, are usually diurnal - awake during daylight and resting during night. However, cattle can be active at night, particularly during the heat of summer.
Same as any other cow: around 24 hours.