In the fastest classes, every other run during eliminations, every run during the finals.
We have so few built drag cars over here that we run up to three times to declare a winner for each round.
the surface is different for each track and gets different treatment, pictured above is the track in Akureyri which is very loose and lightweight dirt/small-chipped gravel track. Its the only purpose built sand drag track in Iceland.
All our other tracks are on the beach near the ocean. Our beaches contain really heavy medium grit black volcanic sand like this :
Trouble with the beaches here is the enormous tides, the sea level changes rapidly.
Here's our friend testing his 632ci monster on one of the beaches: