Shani Davis, (probably one of the world's fastest skaters), did 1500 meters (1.0729 miles) in 1 minute and 42.68 seconds back in March. Do the math and he averaged close to 37.6 mph for the entire mile. I would say for a 9-10 year old to do 39 mph for any period of time would be quite phenomenal. We'll have to have Hakstol keep an eye on him!