Good luck with your application!
So, with BA Korean you'd have 8 hrs/ week of Korean in your first year. You will have two other modules usually, adding 4 more hours to your week. So, twelve hours of contact per week. You will need to put an equal amount of self-study to stay at the top of what you have learnt in class. Language study would usually require to submit weekly homework, which is not actually assignments but you will be advised to stay at the top of it. There will be midterms and end of the term test/exams for the langauge.
It is definitely possible to have hobbies and a part time job, I have one. (I did Intensive Persian in my first year). But it will definitely require you to have good time management skills, as an intensive language course is quite demanding.
Please do not hesitate to get in touch with us, if you have any more question!
MA Iranian Studies and Intensive Persian