How long can an existing Panchayat continue to function after the commencement of the Constitution (Seventy-third Amendment) Act, 1992?
(a) The Legislature of a State referred to in sub-clause (a) of clause (2) may, by law, extend this Part to that State, except the areas, if any, referred to in clause (1), if the Legislative Assembly of that State passes a resolution to that effect by a majority of the total membership of that House and by a majority of not less than two-thirds of the members of that House present and voting;
(b) Parliament may, by law, extend the provisions of this Part to the Scheduled Areas and the tribal areas referred to in clause (1) subject to such exceptions and modifications as may be specified in such law, and no such law shall be deemed to be an amendment of this Constitution for the purposes of article 368. of 243N. Continuance
and Panchayats.— Notwithstanding anything in this Part, any provision of any law relating to Panchayats in force in a State immediately before the commencement of the Constitution (Seventy-third Amendment) Act, 1992, which is inconsistent with the provisions of this Part, shall continue to be in force until amended or repealed by a competent Legislature or other competent authority or until the expiration of one year from such commencement, whichever is earlier:
existing
laws
Provided that all the Panchayats existing immediately before such commencement shall continue till the expiration of their duration, unless sooner dissolved by a resolution passed to that effect by the Legislative Assembly of that State or, in the case of a State having a Legislative Council, by each House of the Legislature of that State.

Existing Panchayats can continue to function until the expiration of their duration, unless they are sooner dissolved by a resolution passed by the Legislative Assembly of the State or, in the case of a State with a Legislative Council, by both Houses of the State's legislature.