A cleric who voluntarily and unlawfully abandons the sacred ministry, for six months continuously, with the intention of withdrawing himself from the competent Church authority, is to be punished, according to the gravity of the offence, with suspension or additionally with the penalties established in can. 1336 §§ 2-4, and in the more serious cases may be dismissed from the clerical state.
Source: Code of Canon Law (Vatican.va)