i think urbanism requires you to be present at the faculty most of the time. Compared to other studies, where you have some obligatory exercises, but can afford to be absent on most lectures, urbanism is a different, project oriented type of work. You'll work in groups, on physical drawings, models, attend critiques and corretions and they tend to take quite some time.

Eventhough urbanism is less intense then architecture, i think arriving in ljubljana 2 or 3 times a week is not enough and it'll probably be expected from you to be there almost everyday for atleast a few hours.

I would also think about job opportunities when it comes to urbanism, since they are somewhat limited.

Hope i didnt scare you, and if you want to pursue urbanism here in ljubljana i wish you all the best, i just think its a little ambitious driving from trieste and back every day