It will be in the unit of study guides, at the individual department websites. For a unit worth 6 credit points, it should average to 6 h per week of formal contact.
It may not be the same each week, too. It could be 3 x 1 h lectures / week for 13 weeks (39 hours) plus 10 weeks with 1 x 3 h lab session (30 weeks) plus 9 weeks with 1 x 1 h tutorials (9 hours) for (39 + 30 + 9) / 13 = 6 h per week average.