I don't have any reliable data other than my own experience. I would guess 10 - 30 km. Sweden is a sparsly populated country. Compared to Germany, we have a te

I don't have any reliable data other than my own experience. I would guess 10 - 30 km. Sweden is a sparsly populated country. Compared to Germany, we have a tenth of the population spread over a larger area. Even though Large parts of the north are practically empty, and the population is concentrated to the cities, the difference is noticeable.