I'm assuming that you are referring to US Constitutional Amendments. The 26th amendment passed the quickest, from proposal to actual enactment. It was proposed March 23 1971 and passed July 1, 1971.
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The 27th Amendment, it took 202 years, 7 months and 12 days for the 27th amendment to be ratified. It was initially submitted to state legislatures for ratification on September 25, 1789 and was completed on May 7, 1992.
12 of the 27 amendments were ratified during the 20th century. the amendment that took the longest to be ratified was congressional pay, passed in 1992 it took 202 years 7 months and 12 days to be ratified
27th amendment
The amendment must be proposed by either the states or Congress and then ratified by the states.
William Henry Harrison had the shortest presidential term of 31 days