Had one of the last remaining wild/crazy cows in the herd (only stayed as long as she did 'cause she raised the BEST calf) go down pushing hard against the headcatch in the crappy old chute we had 4 years ago - couldn't get her released 'til I ran to the barn and got a crowbar to pry the latch up with. I'm guessing she was like that for maybe 5 minutes, max. Must have avulsed both brachial plexuses(the main nerve trunks to the front legs), 'cause she never got up again.
Gave her repeated doses of dex & banamine, hauled her feed & water, flipped her at least 4 times a day. Still had fight in her for about 2 weeks, but when she gave up trying to get me, I knew it was all over.
30 minutes? Seems like an awful long time to do a pregnancy test.