For one person with hand milking, one at a time. For when automatic machines are used, around a dozen or more cows can be milked at a time in a milking parlour on a commercial dairy farm.
This question is impossible to answer because the number of cows per farm differs, as well as number of cows on farm per day, since cows that were milked one day wouldn't be milked the next or vice versa because either they'd be culled and sold, come down with a sickness, be of the time to be dried up before calving, or start giving milk as heifers or (for older cows) after calving, etc.
When milked, cows produce plain milk. The milk is safe to drink right then if one chooses. Otherwise, it is sent to stores where consumers can choose what kind they want (2%, whole, etc).
It can be, yes. It would be made so that the cows walk in one door, get milked, then walk out another door.
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2-4 calves
Steller's Sea Cows became extinct in 1768. Dugongs and manatees, which are related to Steller's Sea Cows, only have one calf at a time so it's very probable that Sea Cows only had one calf at a time as well.
Graze on Grass, and Sleep, One would think they would Enjoy being Milked, but you would Have to Research their Brainwaves and Nerve Reactions to See how much They like it.
The milk that collects in her udder can make it swollen and painful if it isn't taken out often enough. So the cows are milked early in the morning and late in the afternoon. They learn that milking takes away the discomfort of a very full udder and will walk to and from the milking sheds of their own accord, with no need to be rounded up.
Cows can have one or two calves at a time. Odd time she'll give birth to triplets.
one liter of cows milk weights one kilogram
It all depends on how many cows a bull has to settle in one day and how much libido the bull has. It should be safe to say that a bull may mate with one or more cows at least 10 to 20 times a day. If a bull has a lot of cows to breed, there's no time for eating, but lots of time for courting.
No they don't. Milking cows, or dairy cows are a different type of cow than beef cows are. Dairy cows give birth to dairy cows, no matter if they are crossed with a beef breed or not. The dairy-beef crossbred cow as a result still has stronger dairy qualities in her than her dairy mother.