还是主裁说了算。。
Allowance for Time Lost
Allowance is made in either period for all time lost through:
- substitution(s)
- assessment of injury to players
- removal of injured players from the fi eld of play for treatment
- wasting time
- any other cause
The allowance for time lost is at the discretion of the referee.

Many stoppages in play are entirely natural (e.g. throw-ins, goal kicks).
An allowance is to be made only when these delays are excessive.
The fourth official indicates the minimum additional time decided by
the referee at the end of the final minute of each period of play.
The announcement of the additional time does not indicate the exact
amount of time left in the match. The time may be increased if the
referee considers it appropriate but never reduced.
The referee shall not compensate for a timekeeping error during the
first half by increasing or reducing the length of the second half.
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FROM 211.99.222.*