6. A teacher laid off for surplus of personnel, who teaches 20 days at the elementary level, 95 periods at the secondary level or 45 periods at the college level during each school year following the year of such lay-off, may be credited with those teaching days or periods if he again holds an employment contemplated by this plan within 30 months from the end of the school year in which he was laid off.
To be credited with such days or periods, the teacher, within one year following the date of his return to work in employment contemplated by this plan, shall apply therefor and pay the contributions provided for by the plan.
1974, c. 63, s. 3; 1983, c. 24, s. 2.