Teachers shall be considered to have been employed for an entire school year for service crediting purposes if and only if they have been reported by the employer to the Retirement System as being paid on the payroll for not less than 200 days (including paid vacation and paid holidays) between September 1st of any calendar year and August 31st of the following calendar year.
N.Y. Comp. Codes R. & Regs. Tit. 2 § 343.2