I re-anneal match brass after 5 firings. Some people do it more often. Some people never do it. Some people know how to do it. Some people repeat old wives tales about annealing. Some people don't think you can restore the original ductility of the neck annealing at home without a double torch machine and so just retire match brass after 2 to 4 matches, depending upon the caliber.
Me, I think I'm doing a proper job with a single torch on something like a small bore .223/5.56 case. I use the machine on other cases.
http://www.lasc.us/CartridgeCaseAnnealing.htm