When you play a sports match at school, you know it'll be over by tea-time.
But sometimes in sport, things can take a lot, LOT, longer!
Novak Djokovic's win over Rafael Nadal in the Australian Open took almost six hours, making it the longest Grand Slam final ever!
But actually that's pretty short compared to some other epic sporting encounters.
Here are Newsround's top 5 longest sports matches...
5 - Baseball - Pawtucket Red Sox v Rochester Red Wings (1981)
The longest baseball game ever lasted more than eight hours. It was suspended at 4am by which time the crowd had shrunk from 1,740 people to just 19! When it restarted two months later, Pawtucket scored a run and clinched the game after just 18 minutes of play!
4 - Tennis - Isner v Mahut (2010)
The first round clash between John Isner from America and Nicolas Mahut from France at Wimbledon 2010 has gone down in tennis history as the longest match ever! It took more than 11 hours to play over the course of three days. Isner finally won it 70-68 in the final set. Both players were given special awards for their epic achievement.
3 - Snooker - Taylor v Davis (1985)
Dennis Taylor and Steve Davis's 1985 World Snooker Championship final is probably the most famous snooker match in history and took almost 15 hours to complete. Taylor lost the first eight frames, but fought back to 17-17. The whole match came down to who could pot the black in the final frame, which Taylor managed, winning the trophy.
2 - Cricket - England v South Africa (1939)
England's cricket match against South Africa in 1939 was played over 10 days, in which time 1,981 runs were scored! After all that time the game ended in a draw because England had to catch their boat back home.
1 - Chess - Kasparov v Karpov (1984)
The World Chess Championships between Garry Kasparov and Anatoly Karpov in 1984 went on for FIVE months. After 40 draws they eventually had to stop for health reasons. Kasparov won the rematch in 1985.