The fastest speedruns in Breath of the Wild are slightly over forty minutes. Link wakes up, rushes to Ganon, and saves the world in the blink of an eye. But the game is full of treasures to find and other tasks to complete. A new speedrun to collect everything takes over two days to fully explore Hyrule.
Source: Kotaku – First 100% Zelda: Breath Of The Wild Speedrun Takes 49 Hours