There are 3 different tracks for the XCO. 

U7 will complete 4 laps (20min aim)
U9 will complete 5 laps (25 min aim)

U11 will complete 4 laps ( 30 min aim)
U13 will complete 5 laps (35 min aim)

U15 Boys will complete 4 laps (40 min aim)
U15 Girls will complete 3 laps (35 min aim)
U 17 + U19 Boys will complete 5 laps (50min aim)