How to manage my time?

Hi, language learners! Let me explain my story. I really have to learn several languages at the same time. I'm an international relations student, so I'm studying English deeply, but specializing in Mandarin Chinese. Now I learn Chinese for 1 hour per day (at least trying to do it regularly). However, I want to return to learning German, but I don't have enough time for it. Moreover, I have a plan to get my master’s degree in Argentina, so I have to learn Spanish (I'm going to move to Argentina in 3 years, so I have enough time, but I must not forget about my Chinese). Can you give me some advice on how to manage time properly for my goals? Maybe someone has experience with intensive learning of several languages?