I recently dispatched 4 roosters using a new (for me) method and it made me think of this post, too. I can back up what the others have said, too - the blood coagulates way too quickly. A lot more quickly than I thought it would, in fact! I was quite shocked. My usual method is using a slaughter cone and cutting the head off while the bird is in it, then I walk away while it drains and come back a few minutes later to find minimal blood in the bucket (like a spoonful maybe). Because the blood drips down the sides of the plastic bag that's in the bucket, and dries there, it's hard to judge the speed of coagulation, so initially I wasn't sure how to answer your question. I knew it happened pretty quickly, but how quickly? Well, the new method I tried with these 4 latest roosters is cervical dislocation ("the broomstick method") where you snap the spine at the neck first, without breaking the skin, then you hang the bird upside down and cut the throat to drain the blood. There isn't much time that passes between the kill and the draining, so you'd think it doesn't matter... but oh man was I wrong! In the time it took me to maneuver the thrashing dead bird (muscle spasms post-kill, normal) into the cone, reach in underneath to find the head, and cut the throat, the blood had coagulated enough to make draining difficult - it had formed a gelatinous plug at the neck. With the first rooster, I waited until the body stopped flailing, so it would be easier for me to put him in the cone to drain - so, maybe a minute or two? No more than three. At that point the blood was too thick to drain. It was a glob at the neck, it wouldn't drain properly and gutting the chicken was really messy - blood everywhere inside the chicken, coming out of the heart, spilling into the organs. It was still liquid inside the chicken, but everything at the neck was a glob that was blocking the draining. So yeah, you literally have just a couple of short minutes to get liquid blood out of a cut on the chicken. But if you were to cut the whole bird open soon after, you could still get liquid blood from inside the body, it just wouldn't be enough to collect or pour anywhere - it would be smeared on the organs and all over your hands.