Mike Raven answers your question.
Homework is important. From the earlier years of schooling to the end of high school (Year 12) the homework load should steadily increase to a minimum of 2 hours each week night. Relaxation or downtime is important as well as sporting pursuits (but not to the detriment of academic performance). Whenever possible parents should provide a variety of experiences to enrich the worldview.
I will talk more about these things in future posts.