Great replies thanks to everyone!
I thought Id add the travel plans so people can give some better advice.
We will take a flight out to Goteborg, travel north to vannersborg. ( I hear there is a nature reserve here with europes biggest deer? ) Then walk back to goteborg for the flight home. Ive worked it out to just under 100 Kilometers give or take but without any maps yet No route has been planned so It could be more or it could be less. Either way I think 7-10 days should be adequate time for us to experience the area and get home in time.
That is very close to my area, and I have done that hike a few times. You can pm me and we can sort something out.