55Except as provided in paragraph 54(1)(b), an employee shall not present a grievance at a level higher than the first level in the grievance process unless the grievance is presented by him in the manner prescribed in subsection 53(1) not later than
(a)
the tenth day after the day on which he received a reply to his grievance at the last preceding lower level, or
(b)
the fifteenth day after the last day on which the employer was required to reply to his grievance at the last preceding lower level under section 56,
55Except as provided in paragraph 54(1)(b), an employee shall not present a grievance at a level higher than the first level in the grievance process unless the grievance is presented by him in the manner prescribed in subsection 53(1) not later than
(a)
the tenth day after the day on which he received a reply to his grievance at the last preceding lower level, or
(b)
the fifteenth day after the last day on which the employer was required to reply to his grievance at the last preceding lower level under section 56,