They published an interesting infographic about the difficulties of learning various languages. Swedish is in the 'easy' category. According to them, six months of study at about 25 hours a week would allow proficiency.
I would really love to do this. I know it would make a big difference to my life in Aspö. If I stay retired, I may just give it a try.
The problem I have is that, living here in Texas, I don't ever have a chance to practice speaking Swedish. I can listen a bit on the radio and TV, and goodness knows there's lots of Swedish to read online. I never have a chance to speak it in the Lone Star state.
But that's a little bit of an excuse. I have Swedish friends here, and I should probably work a lot harder at speaking with them on a regular basis when/if I start studying in earnest.