How many times has the the constitution been amended which amendment wasn't ratified until over 200 years after it was proposed?

The U.S. Constitution has been amended 27 times. The 27th Amendment, which deals with congressional pay increases, was originally proposed in 1789 but wasn't ratified until 1992, over 200 years later. This lengthy ratification process highlights the challenges of constitutional amendments and the evolving nature of governance in the United States.