How many line judges are there in volleyball?

Typically there are two line judges in volleybal. They would stand in opposite corners of the field since each can see two lines different lines of the rectagular playing field.

In more contested games there may be as many as 8, two on each corner, each looking at a different line, and every corner verifying the other corners. In other Words two line judges per one line

(two on one sideline, two on the other sideline, two on one endline, and two on the other endline).