after the treaty of paris how long were the Spanish in charge of FL

The Spanish were in charge until 1821.

http://en.wikipedia.org/wiki/History_of_Florida#Second_Spanish_rule

http://www.flheritage.com/facts/history/summary/index.cfm

After the Treaty of Paris, which was signed in 1783, Spain was in charge of Florida for a total of 20 years. To arrive at this answer, we need to understand the historical context and the events following the Treaty.

The Treaty of Paris ended the American Revolutionary War between Great Britain and the Thirteen Colonies, granting independence to the colonies and establishing the United States. However, the treaty did not directly address the status of Florida, which was a British colony at the time.

To resolve this, the Treaty of Versailles was signed in 1783 between Britain, Spain, and France. As part of the treaty, Britain ceded East Florida and West Florida to Spain, while retaining Canada and other British territories in North America.

So, from 1783 onwards, Spain assumed control of Florida. However, this Spanish control was not permanent. In 1819, the Adams-Onís Treaty was signed between the United States and Spain, which effectively transferred Florida from Spain to the United States.

Therefore, the Spanish were in charge of Florida for a period of 20 years, from 1783 to 1819.