A Volleyball Player?
On average research says 22 times
As many times as a coach wants to, when there's a dead ball.
A volleyball substitution is when a player (or more than one) leaves the game and is replaced by a player from the bench.
every player is needed
In a volleyball game you don't really run but all the hustle and jumping and etc that you do in a game probably equals up to a mile of running :)
up to 12 times in a game
Any player not currently in the game or having played in the game can substitute for and assume the role of the DH.
2 times in each game to 25.
Considering volleyball is a team game, he/she would have been a very lonely person.