24 hour mtn bike race on 8.25 mile course. 24 Hours of Great Glen is a 24-hour mountain bike race wrapped into a weekend-long mountain bike festival in Pinkham Notch, NH. Hardcore racers tackle the singletrack. Less hardcore racers enjoy the atmosphere. Families enjoy the games and 24 Minutes of Great Glen kids� race. New to endurance racing? Try 12 Hours of Great Glen!