If you mean just the NHL, there are upwards of 700 players, or more, who might play in the NHL during the hockey season. However, there are a myriad of minor leagues, junior leagues, and college leagues just in North America. Count in International leagues throughout the rest of the world, and players number well into several thousand, I'm sure.
13 players
22 for Ice Hockey
13 players
Ask USA Hockey.
a lot
11
The most can be 30 players. The minimum is 20 players
seventeen players are recommended to try out and be accepted to a hockeyteam.
11 players each side.
23
Hockey
6 or 7