5-6 days a week, a few hours each day.
It could be better, on both counts. I'm under no illusions about the difficulty involved. It's not like I'm thinking that I'll live there, go on parties on weekends, get laid with the local chicks, upload a few photos and videos on Facebook and quickly become a self defense Guru. I know it's gonna be hell sometimes, but no pain no gain, right?
I don't think you're going there to party. I just think that if you're inexperienced and not in great physical shape, you're going to get a whole lot more pain than gain out of this endeavor. My experience is that for new, out-of-shape students, it's usually a struggle to do more than one hour of training per day. Jumping straight into exercising 5-6 hours per day is asking a lot of your body.
Also, on a logistical level, I don't know how many school owners even teach Hapkido for 6 hours every day, especially to adults. Most full-time dojangs I've seen in the US are usually open for 4-5 hours per weeknight plus a few morning classes, and at least half of the classes are for kids.