Possession time is a much more complicated concept in hockey than it is in soccer, because possession changes so rapidly and because there are extended stretches in which puck possession is contested. Hockey analytics gave up on trying to measure it directly and found that the number of shots taken (which is not just shots on goal, but also those that miss the net and those that are blocked) is an effective proxy for possession (which it is not in soccer, given that far more of ball possession takes place far from the goal). So this is what is used in stats like Corsi.
Which is why battle drills, small space drills/competitions, odd number drills/competitions, keep away type drills, and any drills that create competition for puck possession are so important in hockey. Coaches that fail to realize and do those types of drills in practice everyday are missing the boat. All your standard individual skills are embedded within all those drills. You get good at those drills and you become a better hockey player and the bonus is your Hockey IQ improves at the same time and you don't even realize it.
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