N.D. Cent. Code § 12-54.1-03
Except as provided under section 12.1-32-09.1, offenders committed to the legal and physical custody of the department of corrections and rehabilitation may receive a lump sum or a monthly rate of meritorious conduct sentence reduction for outstanding performance or heroic acts or as a special control and security measure, as provided by penitentiary and department rules and upon written recommendation of a department multidisciplinary team. Meritorious sentence reductions are in addition to sentence reductions under section 12-54.1-01 and may be made only after a written recommendation is made by the warden and approved by the director of the department. Any sentence reduction for special control or security measures may not exceed two days good time per month per offender.
N.D.C.C. § 12-54.1-03