It really depends what you are trying to achieve, but it’s very difficult for anyone to make good progress with any topic in less than 5 hours, total, and we don’t arrange tuition placements for any less than that. We usually recommend a 2 hour session to begin with, and many students stick with that length. Weekly or twice weekly sessions are usual, but this is always open to discussion with the tutor, and depending on the time-limit we can always arrange sessions more or less frequently than that. Part of the service our tutors provide is an initial “consultation”. The tutor will be able to discuss your aims with you, and based on their experience with the topics, will be able to give you an estimate of the time needed. They can also help you to structure your study, in between sessions, to ensure that you are making good progress.