Marathoners and Half Marathoners: You start by completing a partial loop. Every loop after that will be a full loop measuring 2.2508 km long.
For a certified Half-Marathon time, complete the partial plus 9 full loops. The timing system will show 10 laps when you are done.
For a certified Marathon time, complete the partial plus 18 full loops. The timing system will show 19 laps when you are done.