Where did you come across the 16 hour comment by Wrangham? Presumably in his book, not online?
I'm not sure. I may have been mistaken. But if I find it again, I'll let you know.
As regards the duration, Wrangham stupidly made the guess by assuming that humans chew like chimpanzees at the same speed. Yet we bolt our raw meats down mostly, after just a one chew or two, much like carnivores do, so Wrangham's notion is laughable. Besides, our jaws are more adapted to meat-eating than those of chimpanzees.
Hmm, I've seen chimps eat meat and they don't look that slow to me. And I often chew meat down to about the same consistency of ground meat, it still doesn't take me that long to do it. Though I do sometimes bolt it down like you say. It just depends on how much I feel like chewing. I'm under the impression that chewing it down makes for a better digestion as it will be liquified in the stomach, rather than having to wait until it goes through the intestines to be liquified, but I could be wrong.
Something else I've noticed, cooked meat, beef in particular, has a tendency to stick between my teeth, whereas raw beef rarely does that, and when it does it's usually some sort of gummy connective tissue/nerve and not the muscle parts. Also cooked meat seems like it doesn't dissolve normally through contact with saliva, so that when it does get stuck, it will stay there rotting away for long periods if not removed through intense brushing, using a toothpick or flossing. Raw meat however gets cleared away pretty easily on it's own or sometimes with little help. When I was a cooked meat eater I used to carry dental floss with me everywhere I went, and had to floss immediately after a meat meal, especially a beef meal. That happened even when eating blue rare thick steaks where only a tiny part on the outside was seared and the inside was raw. The outside layer browning was enough to make it get stuck. But the more cooked it was, the worse it was. Between the time spent flossing which took me like 5 minutes (or more like 25 minutes if using toothpicks, which I had to use multiple of because most of my teeth are very close together and regular tookpicks just aren't thin enough, so they'd keep breaking), and the time spent to cook meats, plus cleaning cooking instruments, plates, knives and forks, etc (all of which get intensely harder to clean when in contact with cooked versus raw meat), it took me a LOT more time to eat cooked rather than raw meats. Raw meat is easier (not harder) to chew, and it provides at least the same if not more energy in the form of calories or what have you. So the whole idea that eating raw meat took longer is ludicrous to me.