There is no limit on how much stoppage time a referee can add to the end of a soccer game. The length of stoppage time added on is relative to the amount of game time lost during a half of soccer, and there is no maximum amount. If the referee decides stoppage time should be one minute, then it will be one minute.,
There are some times that are fixed in soccer. A professional soccer game is 90 minutes long. At the end of each 45-minute half, the referee is allowed to add any number of additional minutes of play at his own discretion.23-Jun-2014
How much stoppage time is there? That depends on what happened in the match and what the referee decides. Typically, we see just a minute or two at the end of the first half, with three or more at the end of the second half.30-Jun-2018
According to football-bible.com, “Fourth referees usually have two watches, one which he stops every time there is a stoppage in play (such as injuries, substitutes, and goal celebrations) and another one which he runs to count the time spent in each stop.”12-Jun-2014
No, it's not. But they do add time (to cover celebrations). It's around 30 seconds as a rule of thumb, unless they spend five minutes celebrating. Every situation is different, they'll take each one on its merit.31-Oct-2012
The signalled stoppage time may be further extended by the referee. Added time was introduced because of an incident which happened in 1891 during a match between Stoke and Aston Villa. Trailing 1–0 and with just two minutes remaining, Stoke were awarded a penalty.
If the score is equal after 90 minutes, in some competitions the game may go into extra time. Typically, this consists of two further 15-minute halves. Goals scored during the added time are considered part of the final score. If the score is still equal after added time, the game moves onto a penalty shoot out.