He actually drops himself at 0:53, and only stops moving just before the end at 8:20. There is some controversy in the comments on theync over whether it's genuine but I think it is. It looks to me as if it's so slow because the noose is very wide and the drop is minimal - so the pressure isn't enough to completely close his windpipe and in fact you ca hear his rasping attempts to breathe until near the end. His face is red which fits with a hanging which is only closing his jugular veins (and maybe incompletely) but not the arteries, and the agonal spasms look absolutely right and would surely be very hard to fake. And it loos as if he pisses himself slightly at around 1:30 (ie half a minute after he actually starts hanging).