How many subs in hurling?

That is an extremely difficult question to answer. There are about 2500 GAA clubs in Ireland. Not all would have Hurling teams, but those that do would have several teams, usually split by age categories. Some of the larger clubs would have a large amount of teams. You also have school and college teams, some again having several age categories. There are also teams from workplaces. Then on top of that you have county teams, again with various age groups. So you are talking thousands of individual teams. That is the best estimate you are going to get.