How long did it take the Spanish invaders to conquer the Aztecs?

The Spanish invaders, led by Hernán Cortés, took about two years to conquer the Aztec Empire. The conquest began in 1519 and culminated in the fall of Tenochtitlán in August 1521. Factors such as alliances with rival tribes, superior weaponry, and the impact of diseases like smallpox played crucial roles in their success.