We play all our winter matches indoors. The facilities don't want matches to last indefinately, so there's a 2 hour limit. There are always other matches scheduled after ours, so we can't just run over.
Here's the way it works. At exactly the 1 hour and 45 minute mark if one team is ahead by a break, they automatically win that set. If the teams are tied or there's only a 1 game difference, they play a tie-breaker to see who wins that set. At the conclusion of that tie-breaker, if the teams are tied at 1 set each they play a third-set tiebreaker only.
As you can imagine, at the 1 hour and 40 minute mark the team that's ahead starts stalling, and the team that's behind tries to go into hurry-up mode.