How much chicken can live without a head?

How much chicken can live without a head? About 2 years, but so far this is only one case.
 
10 September 1945 g Fruite, Colorado, young cock beheaded, but he survived. Incredibly, the ax has not affected the jugular vein and left enough stem the brain to sustain life. Mike, so named bird, became something of a celebrity of his time. Its owner, Lloyd Olsen, took 25 cents for the opportunity to see "Mike, the headless rooster surprising." Mike earned about $ 4,500 a week and cost 10000dollarov. Cock fed and watered from the pipette, but one night there was a tragedy. His boss forgot pipette on the previous show. Unable to clear their airways, cock choking.