A cow is born with nipples--or rather, teats--therefore this question is impossible to answer. However, if you are asking about the formation of an udder being an indicator to when a cow will give birth, it could be anywhere from days to several weeks.
--milk them
About 12 hours..if your a man
a long time
For the vagina about a week nipples until she done nursing, after nursing it will take 10 to 14 days till all milk is dried up
An average of 42 days is the time is takes for a ferret to give birth.
5345636
It takes 12 months for a dolphin to give birth to another dolphin (calf).
Mollies typically give birth within 4 to 6 weeks after mating.
The time it takes for Molly to give birth can vary, but on average it can take around 6 to 12 hours for a dog to give birth to a litter of puppies.
just over a year
100 Years
I think six weeks