Hi!
I am quite new but, for what I have played, I have seen that they fit your matches (CH.L./S.L., Cup, Associations, League) to those who have your opponents.
I am also a student and sometimes I can not watch the games because I am in class.
You can pay 2 tokens to change the time if you are local and it is a very important game (because if it is a team much worse than yours is not worth it) or prepare a lot for that game and that your players manage alone.