oconee: it is feasible, but obviously you will spend a lot of time in the car... For example, a journey Sounkyo onsen - Utoro is more than 5 hours, and so is the Akan - airport journey...
Wouldn't it ...
It first depends where you start from (where you will be landing and departing from). 6 days is pretty short if you intend to drive a lot, as you have to remember that the maximum speed is 60 km/h, so ...