think i did 3.5miles in a scaled down great north run for youths upto 16 yr old. im 18 now so i dunno what i could do. but when i was 16 i was training for swimming training twice a day every day. so i was pretty fit.
im sure it was 3.5 or 4 miles, (the great north run is 13mi) and i did it in bout 21-22mins. (probably 3.5miles then) wasnt too bad a day, not hot not cold, jus cool. the course wasnt too challenging, no steep hills, basically run up one dual carriage way and then back down the other side