420. Any time limit that is running under the Act respecting the Government and Public Employees Retirement Plan (chapter R-10) in respect of a person who is a member of the Government and Public Employees Retirement Plan and who becomes a member of this plan shall continue to run under the provisions of that Act or, as the case may be, under the corresponding provisions of this Act, and the time elapsed shall be taken into account. The first paragraph also applies to the spouse and the successors of the person referred to in that paragraph and to the persons referred to in sections 411 to 413 of this Act and to their spouse and successors.