How many sessions per week is enough?
In general, the amount of tutoring you receive should be based on four considerations.
Previous Foundation
If you have a solid foundation in the subject and only need occassional help with topics that are less clear and are harder to grasp, once a week would be sufficient. On the other hand, if you have always been struggling with the subject, you might want to consider having several sessions per week.
Urgency of Goals
If you need quick review and test strategies before you write an exam, 2-3 sessions before the test should be sufficient.
Subject
Although many topics can be learned slowly, for rote memorization or concrete skills, such as times tables or long division, daily or almost-daily practice is important.
Cost
Many students do not have the resources to pay tutors for five hours or more a week. If this is the case, there are always ways to get free help from your instructors, tutors that are provided free of charge by certain libraries and at various help centres.