The match duration, main moves, finishing moves and outcome are predetermined. The major events of a match are planned and discussed beforehand, and so is the outcome. Some major events are definitely planned; for instance, someone might interfere in a match just as the bad guy, or “heel” is about to lose. The duration of the match is also predetermined, and the time is kept by the referee. If you time the matches on, say, WWE, you might notice that there are, broadly, 5-, 15-, and 25-minute matches.