Renting a car for a week can be a great option for travel. Hertz, the most popular car rental company for this area, offers rental cars for around $768/week on average.
Typically how long you can rent a car for depends on the inventory of the supplier. For Stokmarknes Airport however, it is certainly possible to rent a car for an entire month.
The monthly cost of a car rental at Stokmarknes Airport is on average $3,290 ($110/day).