The marathon runner in "The Legend of Zelda: Ocarina of Time" appears only after you have completed a certain dungeon. After that, the runner will challenge you to a race that's impossible to win; he will also buy a mask from you during a lengthy side quest. He will show up only during the daytime, and he'll cover a lot of territory.
Instructions
1. Play through the game until you complete the dungeon called Inside Jabu-Jabu's Belly. You should be playing as the child version of Link.
2. Go to Lon-Lon Ranch during daylight hours. If it isn't daylight, play "The Sun's Song" on the ocarina to change night into day. The marathon runner is running in circles going counterclockwise along the dirt path around the ranch.
3. Go around the path that circles the ranch in a clockwise motion to increase your chances of seeing the marathon runner. To pinpoint his location, it can also help to look for the dust trail that the runner kicks up.
Tags: Zelda Ocarina Time, marathon runner, Ocarina Time, that runner, Zelda Ocarina