Each team gets 2 challenges to start the game. If the team uses both challenges and is successful with both, they get a third challenge. If the team uses both challenges and is not successful with both, they do not get a third challenge. Three is the most challenges a team can have in an NFL game.
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4 challenges
Another answer:Teams have two challenges per half. HOWEVER, if a coach uses both challenges and WINS them both, they receive a "bonus" third challenge.
Well, I guess you could say there are many but mainly a challenge is if the other team thinks the play is false. The reason I said that there could be many different one is because the other team could challenge thinking that a touchdown was false or a first down. That's all.
You get two challenges per game. If you you challenge twice and both are successful, you are given a third challenge. You may use both your challenges in a half.
A team starts the game with two challenges. If they use both challenges and are correct with both, they are given a third challenge.