How many years did the United States have the Articles of confederation at the time of the convention?

The Articles of Confederation, which served as the first constitution of the United States, were in effect from March 1, 1781, until March 4, 1789. The Constitutional Convention, which resulted in the current U.S. Constitution, took place from May 25 to September 17, 1787.

So, if we calculate the number of years the United States had the Articles of Confederation at the time of the convention, we would start from March 1, 1781, and go until May 25, 1787.

This gives us a total of 6 years and nearly 3 months.