The amount of time your child spends in university classes is collectively known as their contact hours/time. Non-contact time is the time your child spends studying outside of contact hours (e.g. doing research and completing assignments).
The recommended amount of time your child should spend studying out of class varies depending on which topics your child is enrolled in and their study load (how many topics they are enrolled in, i.e. whether they are part-time or full-time students).
As an indicator, full-time students should consider studying a university degree to be like a full-time job in terms of time spent studying; contact hours and non-contact studies will amount to approximately 40 hours per week.
Once your child selects topics to enrol in they can work out their contact hours by adding up the time spent in lectures and classes.