A well-designed homeschool curriculum minimizes homework.
If a student puts in an hour per course per day, that should be sufficient for a properly designed course. The goal of formal education is understanding, not memorization. There is a great need to understand connections.
The Good Curriculum assigns one hour a day per course: half reading, half listening to a lecture. That is all a student needs. On day five, there is a writing assignment or a test (math and science). There is also a half-hour review of the week’s lessons. There is no reading assignment on day five.
If you limit formal homeschooling to one hour per course per day, the student will have time for extra-curricular activities, such as a part-time apprenticeship or starting a home business.