Recently I have been contacted by several parents who want to do tutoring once/week. Their reasons for not being able to do more sessions vary, from a lack of funds, to not wanting to over work their child, to competing activities.
In the past, I have really tried to work with our students who could only come once/week. Ultimately, it has proven to be frustrating both for the child and the tutor, because they do not see enough progress being made. The child ends up falling farther and farther behind, and feels like just giving up.
Orton-Gillingham is an intensive style of tutoring, originally intended to be done 5 days per week for at least an hour. Many experts and programs advocate that twice/week tutoring is the bare minimum that will work. We have seen this first-hand over the years, and so we now only offer tutoring twice/week or more. (The only exceptions to this would be children who are at or above grade-level and who are not in danger of falling behind.)