Juan Carlos can be King for as long as he lives if he so desires. Royalty is not term limited.
According to the line of succession, after Juan Carlos I de Borbon, his son Felipe, Prince of Asturias will be rule.
The King juan Carlos is still alive and in his charge, but in Spain, as a constitutional monarchy, the King don't rule but reign. The power belongs to the democratic elected bodies and the king has, as Head of State, only protocolary duties.
Felipe VI is the current King of Spain. Since King Juan Carlos I passed on the monarchy to his son, he has still retained the title "King", but no longer performs the requisite ceremonial functions. Felipe VI has quite a bit of influence but he does not "rule." The country is governed by a President and a Parliament. The President is elected from the Parliament, by the Parliament, which is, in turn, elected by the people. Spain is a Constitutional Monarchy with a democratically elected government. The head of government is called the Presidente del Gobierno (President of the Government) and his name is Mariano Rajoy Brey (Mr. Rajoy).
Immediately after Franco's death, his will was followed leading to an Absolute Monarchy under his protégé Juan Carlos I (grandson of deposed King Alfonso XIII). Juan Carlos made sweeping reforms within the first few years of his rule and made himself a Constitutional Monarch. He continued to cede more and more powers until by the mid-1980s, Spain operated very similarly to the United Kingdom: a parliamentary democracy with royalty as the head of state.
The Bourbons were (and are) a European Royal Dynastic house, ruling France until the 1800's. The current King of Spain, King Juan Carlos is from the House of Bourbon.
i hostey don't know
The Moors ruled Spain for about 700 years.
Spain ruled Mexico for 300 years, from 1521 until 1821.
From 1511 to 1898; 387 years.
302 years: from 1519-1821.
i thought 15 but may be wrong. Sorry if i am.
Argentina.