They changed it a few years back you just get an extra penalty each time eg if NYR challenged and failed there it's 4 minutes
You are correct sir:
How many coach’s challenges do they have?
They have had countless coach challenges since the 2019-20 season, but can they challenge every goal? Yes, why not? It is worth a shot! However, there is a catch in this unlimited number of challenges I mentioned earlier; if the challenge goes wrong, the team will receive a 2-minute minor penalty. And further subsequent wrong challenges will be added to the previous minor penalty time. This means the 2-minute penalty will become a 4-minute penalty.
Before this new change (in the 2015-16 season), the team had to use its timeout to call a challenge, and if it became wrong, the team would lose a timeout.
So, the coach should call a challenge when there is some authenticity. If not, then they have to pay the price. Imagine 5 minutes left in a game to end, and the coach challenges a call while they have already proved wrong before, and they fail the challenge again, then the team would be shorthanded for the 4 minutes. This can become a key point between losing and winning a game.