at least 6.
In indoor volleyball there are six players on the court. In beach, outdoor volleyball there are two players.
Normally, there are two players in a game of beach volleyball.
There are 6 players on a regulation volleyball team.
Six players must be on the court at a time.
6 players per team
There are many different leagues for volleyball, for beach volleyball they usually have two players on each side of the court, but for outdoor volleyball they'll either have four or more players on each side, and for indoor volleyball they have six players on each side of the court.
6 players are allowed on court per side in a volleyball game. However, you can have up to 6 other substitutions on the bench.
On a normal volleyball court: 6 players beach volleyball: 2 players