Final answer:
The standard ratification period for amendments set by Congress, as evidenced in several amendments such as the 18th and 21st, is seven years from the date of its submission to the states by Congress.
Step-by-step explanation:
The question you're asking about pertains to ratification periods for proposed amendments to bylaws or constitutions. Ratification is the official way to confirm something, usually by vote. It is a term often associated with constitutions and governmental procedures.
The standard period set by Congress for the ratification of amendments to the U.S. Constitution, as seen in the 18th, 20th, 21st, and 22nd Amendments, is seven years. This period starts from the date when the amendment is submitted to the states by Congress. This time frame establishes the maximum duration during which the states can ratify an amendment, after which it becomes inoperative if not ratified by the required number of states.