Well, it did heat up because it "smoked" when I turned it.
Now whether that was hot enough to kill weed seeds I don't know.
I used it regardless, because it was from my horses and I had a lot of it. The heat part also depends on the age. If it's been sitting around and has lost that special "freshness"

then it's not going to get as hot. Mine was just straight HM, no bedding. If it has bedding in it that will change things up too. Shavings would take longer to compost than straw bedding. A lot of gardeners kinda look down on HM as a garden additive but I found it did a fine job in my soil. But I love all things equine, so I'm biased.
One word of caution, if the horses have been on bermuda hay ,you better make good and certain the pile heats up HOT or you will forever and ever be fighting bermuda in your beds

. I can't tell you how long it took cuz I don't know. I always had several piles going and wasn't in a particular rush to use it. If you forced me to guess i'd say 2 or 3 months-ish (?).
Chickens aren't a reliable way of turning your pile IMO. Sure they like to "help", but they kind of scatter it, and what you want to aim for is about a 4x4x4 foot pile, and let it stay compact and "work" for some days in between turnings. Whew! Hopefully this is at least a tiny bit helpful and not just a lot of b.s.!