Must maintain own personal license at mas-. ter/instructor level during the entire period of. apprenticeship. 2. Must validate hours for apprentice monthly. These hours are reported from the first of the. month through the end of the month and must. be in the Boardâs office no later than the 15th. of the month after the hours have been. earned. (Example: hours earned in January. must be in the Board Office by February 15th.)