The event is normally 18 miles ( 28 Kilometres ) on the Saturday and 12 miles ( 19 Kilometres ) on the Sunday. The Main Event covers both Saturday and Sunday, camping over night on the Saturday. The Veterans covers Saturday and Saturday night. The Mini Trek does a 9 mile walk on Saturday, camping over night and a 6 mile walk on Sunday. At the end of each leg of the route the teams arrive at a check point. Here they can replenish water and carry out some form of incident. They then carry on to the next grid reference which is given at that check point.