Residential, Journeyman, and Master Plumbers (8 hours) A minimum of eight (8) hours of CE must be completed every 12 months during the license cycle The continuing education hours must be selected from among the Core Competencies in any combination, but note that: within every twenty-four month period, a minimum of four (4) CE hours must be related to codes as defined in board's rules Additionally, no more than two (2) hours will be accepted in CE courses related to safety training