The Governor may grant leave of absence for a time not to exceed three (3) months in the year to any officer at a time when the duties of his office will admit of the absence without injury to the public service; but a judge, district attorney, and the attorney general shall not have a leave of absence which will interfere with his presence at any term of court at which he should be present. Nor shall a public service commissioner have a leave of absence which will interfere with his presence at any session or meeting of the public service commission.