Every student varies in terms of how much support is best for them. After the initial free trial, your tutor will help recommend how many hours is best for your student.
In our experience, students who receive at least 2 hours per week see much better results. The extra time each week allows them to not just catch up, but build on their knowledge and get ahead.
Likewise, our 3 hour per week plan is popular with students looking to make rapid improvement (e.g. in preparation for an exam or test).