The Intern Certificate will be issued for the period of time necessary for the candidate to complete the approved intern program, but this time period will not exceed 3 years of service.
22 Pa. Code § 49.92
This section cited in 22 Pa. Code § 49.1 (relating to definitions); 22 Pa. Code § 49.2 (relating to inactivity and invalidity); and 22 Pa. Code § 403.4 (relating to highly qualified teachers).