Section 411-404-2 - Teachers Creditable Service Before July 1, 19911. Regular, full-time teachers paid a full contract will be given credit for a full year.2. Substitutes - service credit is granted based upon the number of days worked pro-rated against 180 days, and the resulting portion of a year of service is earned.3. Tutors, Adult Education and Part-time Teachers - service credit is granted based upon the number of hours worked pro-rated against 900 hours, and the resulting portion of a year of service is earned.94- 411 C.M.R. ch. 404, § 2