The duration of a tennis match becomes multiple answers because it is really variable; and it is that, in effect, they do not have an exact or determined time. The games can go from half an hour, up to 5 or 6 hours. There are even records of up to 11 hours (the final Wimbledon championship in 2010).
To win a tennis match, two sets are necessary, but world championships like the Grand Slam or the Davis Cup need about 3 sets.
In short, this time in tennis is a mystery. The game can be so exciting and become such a competitive alternation that it can last for a few hours.
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Tennis is one of those sports of changing duration and it is very common to see in the great world championships and particularly, in the final matches, an extended time and usually quite long to tell the truth.