Up to 14 in USAV Volleyball. It may depend on what organization you are playing with, though.
Yes there are substitutes in volleyball but a coach/team can only have so many subsitutions. There can only be 10 subsitutions per game and an overall 30 substitutions for a match of 2 out of 3 games or an overall of 50 substitutions for a match of 3 out of 5 games.
There are 15 players on a pitch, there are 22 members on a squad, allowing fro seven subsitutions during the game.
as many as you would like but in a real volleyball game 6 on each team and there is 2 teams so 12 people can play in a game of volleyball.
There are no parts
There are no quarters in a volleyball game. Their called "sets" its a game and you either play best 2 of 3 or 3 of 5.
Normally, there are two players in a game of beach volleyball.
at least 6.
6
2
10
25
15