I tried learning Russian in college, but found that by the second year, the Russian homework was chewing up 60% of my homework time, and it was an elective class. So, I dropped it.
I did learn (or so they thought) Korean in the Air Force, which is partially where my screen name comes from.
But that was more than 20 years ago. I find that I remember more Korean when I've had a few drinks, but without any means to practice it with a real person, it faded quickly once I got out in '94.
I spoke fluent Thai after two days and about 130,000 baht