Dota 2 Game Length

Matches vary in length and are influenced by factors such as:

Game mode: Some modes, like Turbo mode, are designed to be faster than regular Dota 2 matches.
Skill level of players: In higher skill brackets, players tend to be more efficient and games may be shorter.
Course of the game: If one team snowballs an early lead, the game may end quicker. Conversely, very close games can drag on for longer.

How long are normal games in Dota 2?

In the current patch 7.39d a normal game lasts on average 41.2 minutes. 90% of the games are completed between 24.9 and 59.2 minutes.

In the current patch 7.39d a turbo game lasts on average 25.3 minutes. 90% of the games are completed between 16.0 and 37.0 minutes.