A range of 4.66 miles/7.5 kilometers to 10 miles/16.09 kilometers may be the distance that each "poronkusema" measures.

Specifically, the poronkusema is a traditional Finnish unit of measurement. It tracks the distance between rest stops for reindeer. The variation depends upon such factors as the age of the reindeer, the terrain, the weather conditions and the weight of the load. Any greater distance between rest stops risks damaging the reindeers' sensitive urinary tracts.