14 days is great. I stayed 10 nights - basically took one day to arrive in the evening, one day to rest, one examination day, one surgery day and 7 days later the post op examination and the day after that I left. I wish I had 3 days before the examination as I was still exhausted on that day, but the flight from Germany was long - I took almost 22 hours from door to door with getting to and from the airports, check in, two transfer stops,...
I think Korea was expensive, but that's probably because the EURO was really getting bad just a few months before I went there. I guess for americans its cheaper there.