In volleyball, a single player can hit the ball consecutively as many times as they can during a rally, but the same player cannot hit the ball twice in a row and only touches the ball once per play unless the ball is hit multiple times in a single play due to a block or other allowable actions.
Typically, the answer to your question in the context of standard volleyball rules would be 1, as a player can only hit the ball once during each team touch before it must be sent over to the other side or played by another teammate.