At HegartyMaths, we have found that student achievement and retention is best when students take the below approach to their HegartyMaths homework:
1) Watch the video through - about 10 minutes
2) Make good quality notes - about 10-20 minutes
3) Take the assessment. Write down the question and all your workings, and also mark your work as you go - about 10-15 minutes
We would expect that a single skill, done well, would take a student between 30-45 minutes
We also recommend teachers set one or two skills per week, but this is very much up to the school to decide.