Section 23(2)(a) in The Maharashtra Employees of Private Schools (Conditions of Service) Rules, 1981
(a)The total number of hours spent by a part-time teacher in teaching in one or more schools as also the number of hours spent by him in tuition shall not exceed the total number of hours spent in teaching in a school by a full-time teacher plus the number of hours permitted for undertaking private tuition by a full-time teacher.