Bought three bred beef cows from a neighbor yesterday. He got them from a different guy during the previous week, saved these three for me. So they've been stressed a bit lately. I have them in a 5 acre pasture. They are still pretty wary of us and won't come near the fence line which is closest to the buildings. That of course is where the water tank is. I have been checking, and they haven't had any water for at least 30 hours now. How long can they go? They have also been grazing a bit, but haven't touched the hay yet either.