any player on the field or the head coach
In the NFL, a coach gets to challenges a game. If the coach does not agree with the call on the field by the ref, then the coach throws the red flag that is in his pocket onto the field where the referee can see it. If the call on the field is reversed, then that team that challenged the call does not lose a timeout, but if the call on the field stands then that team loses a timeout.
Stopping the game because a player is hurt.
Yes.Simply put... Yes.
There are seven officials during a NFL game
Then the timeout is not called.
At the end of a game.
Six, three in the first half, three in the second half. If the game goes into over time, each team gets an additional three.
The average NFL game is about 3 hours long, but the clock freezes when the play is dead, the quarter back calls a timeout, there are commercials, or when someone goes out of bounds so there is really only about 12 full minutes of action!